diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4bf8f6ed43..ee1612d096 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,8 @@
 - Rename `filters` option to `redactedKeys` [#704](https://github.com/bugsnag/bugsnag-js/pull/704)
 - Rename `device.modelName` to `device.model` [#726](https://github.com/bugsnag/bugsnag-js/pull/726)
 - Rename `client.refresh()` to `client.resetEventCount()` [#727](https://github.com/bugsnag/bugsnag-js/pull/727)
+- `client.use(plugin)` has been removed and plugins must now be passed in to configuration [#759](https://github.com/bugsnag/bugsnag-js/pull/759)
+- Invalid configuration (except for `apiKey`) now falls back to default values rather than throwing an error [#759](https://github.com/bugsnag/bugsnag-js/pull/759)
 
 ### Removed
 - Remove non-public methods from `Client` interface: `logger()`, `delivery()` and `sessionDelegate()` [#659](https://github.com/bugsnag/bugsnag-js/pull/659)
diff --git a/UPGRADING.md b/UPGRADING.md
index e71e974dcb..c10cd22d1c 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -129,6 +129,9 @@ Many options have been renamed, reworked or replaced.
 +   onBreadcrumb: (breadcrumb) => {
 +     // a callback to run each time a breadcrumb is created
 +   }
+
+    // plugins must now be supplied in config rather than via client.use()
++   plugins: []
   }
 ```
 
@@ -364,6 +367,45 @@ Previously it was valid to supply a `notify` endpoint without supplying a `sessi
   }
 ```
 
+## Plugins
+
+Plugins must now be supplied in configuration, and the `client.use()` method has been removed. For users of the following plugins, some changes are required:
+
+### `@bugsnag/plugin-react`
+
+```diff
+- import bugsnagReact from '@bugsnag/plugin-react'
++ import BugsnagPluginReact from '@bugsnag/plugin-react'
+
+- const bugsnagClient = bugsnag('YOUR_API_KEY')
++ Bugsnag.start({ apiKey: 'YOUR_API_KEY', plugins: [new BugsnagPluginReact(React)] })
+
+- bugsnagClient.use(bugsnagReact, React)
+```
+
+### `@bugsnag/plugin-vue`
+
+```diff
+- import bugsnagVue from '@bugsnag/plugin-vue'
++ import BugsnagPluginVue from '@bugsnag/plugin-vue'
+
+- const bugsnagClient = bugsnag('YOUR_API_KEY')
++ Bugsnag.start({ apiKey: 'YOUR_API_KEY', plugins: [new BugsnagPluginVue(Vue)] })
+
+- bugsnagClient.use(bugsnagVue, Vue)
+```
+
+### `@bugsnag/plugin-{restify|koa|express}`
+
+Since these plugins don't need any input, their usage is simpler and follows this pattern
+
+```diff
+- bugsnagClient.use(plugin)
++ Bugsnag.start({
++   plugins: [plugin]
++ })
+```
+
 ---
 
 See the [full documentation](https://docs.bugsnag.com/platforms/javascript) for more information.
diff --git a/packages/browser/src/config.js b/packages/browser/src/config.js
index c7dd123d37..e4a6173246 100644
--- a/packages/browser/src/config.js
+++ b/packages/browser/src/config.js
@@ -1,17 +1,14 @@
 const { schema } = require('@bugsnag/core/config')
 const map = require('@bugsnag/core/lib/es-utils/map')
 const assign = require('@bugsnag/core/lib/es-utils/assign')
-const stringWithLength = require('@bugsnag/core/lib/validators/string-with-length')
 
 module.exports = {
-  releaseStage: {
+  releaseStage: assign({}, schema.releaseStage, {
     defaultValue: () => {
       if (/^localhost(:\d+)?$/.test(window.location.host)) return 'development'
       return 'production'
-    },
-    message: 'should be set',
-    validate: stringWithLength
-  },
+    }
+  }),
   logger: assign({}, schema.logger, {
     defaultValue: () =>
       // set logger based on browser capability
diff --git a/packages/browser/src/notifier.js b/packages/browser/src/notifier.js
index 456b0d7bca..36c4b560c9 100644
--- a/packages/browser/src/notifier.js
+++ b/packages/browser/src/notifier.js
@@ -40,30 +40,32 @@ const Bugsnag = {
     if (typeof opts === 'string') opts = { apiKey: opts }
     if (!opts) opts = {}
 
+    const internalPlugins = [
+      // add browser-specific plugins
+      pluginDevice(),
+      pluginContext(),
+      pluginRequest(),
+      pluginThrottle,
+      pluginSession,
+      pluginIp,
+      pluginStripQueryString,
+      pluginWindowOnerror(),
+      pluginUnhandledRejection(),
+      pluginNavigationBreadcrumbs(),
+      pluginInteractionBreadcrumbs(),
+      pluginNetworkBreadcrumbs(),
+      pluginConsoleBreadcrumbs,
+
+      // this one added last to avoid wrapping functionality before bugsnag uses it
+      pluginInlineScriptContent()
+    ]
+
     // configure a client with user supplied options
-    const bugsnag = new Client(opts, schema, { name, version, url })
+    const bugsnag = new Client(opts, schema, internalPlugins, { name, version, url })
 
     // set delivery based on browser capability (IE 8+9 have an XDomainRequest object)
     bugsnag._setDelivery(window.XDomainRequest ? dXDomainRequest : dXMLHttpRequest)
 
-    // add browser-specific plugins
-    bugsnag.use(pluginDevice)
-    bugsnag.use(pluginContext)
-    bugsnag.use(pluginRequest)
-    bugsnag.use(pluginThrottle)
-    bugsnag.use(pluginSession)
-    bugsnag.use(pluginIp)
-    bugsnag.use(pluginStripQueryString)
-    bugsnag.use(pluginWindowOnerror)
-    bugsnag.use(pluginUnhandledRejection)
-    bugsnag.use(pluginNavigationBreadcrumbs)
-    bugsnag.use(pluginInteractionBreadcrumbs)
-    bugsnag.use(pluginNetworkBreadcrumbs)
-    bugsnag.use(pluginConsoleBreadcrumbs)
-
-    // this one added last to avoid wrapping functionality before bugsnag uses it
-    bugsnag.use(pluginInlineScriptContent)
-
     bugsnag._logger.debug('Loaded!')
 
     return bugsnag._config.autoTrackSessions
diff --git a/packages/browser/types/test/fixtures/plugins.ts b/packages/browser/types/test/fixtures/plugins.ts
index 11d7ec6303..58b35cc114 100644
--- a/packages/browser/types/test/fixtures/plugins.ts
+++ b/packages/browser/types/test/fixtures/plugins.ts
@@ -1,7 +1,9 @@
 import Bugsnag from "../../..";
-Bugsnag.start('api_key');
-Bugsnag.use({
-  name: 'foobar',
-  init: client => 10
-})
+Bugsnag.start({
+  apiKey:'api_key',
+  plugins: [{
+    name: 'foobar',
+    load: client => 10
+  }]
+});
 console.log(Bugsnag.getPlugin('foo') === 10)
diff --git a/packages/core/client.d.ts b/packages/core/client.d.ts
index 64dc0a3f44..9f50ffcf88 100644
--- a/packages/core/client.d.ts
+++ b/packages/core/client.d.ts
@@ -1,4 +1,4 @@
-import { Client, OnErrorCallback, Config, Breadcrumb, Session, OnSessionCallback, OnBreadcrumbCallback } from './types'
+import { Client, OnErrorCallback, Config, Breadcrumb, Session, OnSessionCallback, OnBreadcrumbCallback, Plugin } from './types'
 
 interface LoggerConfig {
   debug: (msg: any) => void
@@ -14,7 +14,7 @@ interface LoggerConfig {
  * module itself once it is converted to TypeScript.
  */
 export default class ClientWithInternals extends Client {
-  public constructor(opts: Config)
+  public constructor(opts: Config, schema?: {[key: string]: any}, internalPlugins?: Plugin[])
   _config: { [key: string]: {} }
   _logger: LoggerConfig
   _breadcrumbs: Breadcrumb[];
diff --git a/packages/core/client.js b/packages/core/client.js
index 5909655702..0c299a012a 100644
--- a/packages/core/client.js
+++ b/packages/core/client.js
@@ -5,6 +5,8 @@ const Session = require('./session')
 const map = require('./lib/es-utils/map')
 const includes = require('./lib/es-utils/includes')
 const filter = require('./lib/es-utils/filter')
+const reduce = require('./lib/es-utils/reduce')
+const keys = require('./lib/es-utils/keys')
 const assign = require('./lib/es-utils/assign')
 const runCallbacks = require('./lib/callback-runner')
 const metadataDelegate = require('./lib/metadata-delegate')
@@ -13,12 +15,11 @@ const runSyncCallbacks = require('./lib/sync-callback-runner')
 const noop = () => {}
 
 class Client {
-  constructor (configuration, schema = config.schema, notifier) {
+  constructor (configuration, schema = config.schema, internalPlugins = [], notifier) {
     // notifier id
     this._notifier = notifier
 
     // intialise opts and config
-    this._opts = configuration
     this._config = {}
     this._schema = schema
 
@@ -56,7 +57,10 @@ class Client {
     this.Breadcrumb = Breadcrumb
     this.Session = Session
 
-    this._extractConfiguration()
+    this._config = this._configure(configuration, internalPlugins)
+    map(internalPlugins.concat(this._config.plugins), pl => {
+      if (pl) this._loadPlugin(pl)
+    })
 
     // when notify() is called we need to know how many frames are from our own source
     // this inital value is 1 not 0 because we wrap notify() to ensure it is always
@@ -90,25 +94,53 @@ class Client {
     this._context = c
   }
 
-  _extractConfiguration (partialSchema = this._schema) {
-    const conf = config.mergeDefaults(this._opts, partialSchema)
-    const validity = config.validate(conf, partialSchema)
+  _configure (opts, internalPlugins) {
+    const schema = reduce(internalPlugins, (schema, plugin) => {
+      if (plugin && plugin.configSchema) return assign({}, schema, plugin.configSchema)
+      return schema
+    }, this._schema)
+
+    // accumulate configuration and error messages
+    const { errors, config } = reduce(keys(schema), (accum, key) => {
+      const defaultValue = schema[key].defaultValue(opts[key])
+
+      if (opts[key] !== undefined) {
+        const valid = schema[key].validate(opts[key])
+        if (!valid) {
+          accum.errors[key] = schema[key].message
+          accum.config[key] = defaultValue
+        } else {
+          accum.config[key] = opts[key]
+        }
+      } else {
+        accum.config[key] = defaultValue
+      }
 
-    if (!validity.valid === true) throw new Error(generateConfigErrorMessage(validity.errors))
+      return accum
+    }, { errors: {}, config: {} })
 
-    // update and elevate some special options if they were passed in at this point
-    if (conf.metadata) this._metadata = conf.metadata
-    if (conf.user) this._user = conf.user
-    if (conf.context) this._context = conf.context
-    if (conf.logger) this._logger = conf.logger
+    // missing api key is the only fatal error
+    if (schema.apiKey && !config.apiKey) {
+      throw new Error('No Bugsnag API Key set')
+    }
+
+    // update and elevate some options
+    this._metadata = config.metadata
+    this._user = config.user
+    this._context = config.context
+    if (config.logger) this._logger = config.logger
 
     // add callbacks
-    if (conf.onError && conf.onError.length) this._cbs.e = this._cbs.e.concat(conf.onError)
-    if (conf.onBreadcrumb && conf.onBreadcrumb.length) this._cbs.b = this._cbs.b.concat(conf.onBreadcrumb)
-    if (conf.onSession && conf.onSession.length) this._cbs.s = this._cbs.s.concat(conf.onSession)
+    if (config.onError && config.onError.length) this._cbs.e = this._cbs.e.concat(config.onError)
+    if (config.onBreadcrumb && config.onBreadcrumb.length) this._cbs.b = this._cbs.b.concat(config.onBreadcrumb)
+    if (config.onSession && config.onSession.length) this._cbs.s = this._cbs.s.concat(config.onSession)
 
-    // merge with existing config
-    this._config = assign({}, this._config, conf)
+    // finally warn about any invalid config where we fell back to the default
+    if (keys(errors).length) {
+      this._logger.warn(generateConfigErrorMessage(errors, opts))
+    }
+
+    return config
   }
 
   getUser () {
@@ -119,9 +151,8 @@ class Client {
     this._user = { id, email, name }
   }
 
-  use (plugin) {
-    if (plugin.configSchema) this._extractConfiguration(plugin.configSchema)
-    const result = plugin.init.apply(null, [this].concat([].slice.call(arguments, 1)))
+  _loadPlugin (plugin) {
+    const result = plugin.load(this)
     // JS objects are not the safest way to store arbitrarily keyed values,
     // so bookend the key with some characters that prevent tampering with
     // stuff like __proto__ etc. (only store the result if the plugin had a
@@ -286,9 +317,20 @@ class Client {
   }
 }
 
-const generateConfigErrorMessage = errors =>
-  `Bugsnag configuration error\n${map(errors, (err) => `"${err.key}" ${err.message} \n    got ${stringify(err.value)}`).join('\n\n')}`
+const generateConfigErrorMessage = (errors, rawInput) => {
+  const er = new Error(
+  `Invalid configuration\n${map(keys(errors), key => `  - ${key} ${errors[key]}, got ${stringify(rawInput[key])}`).join('\n\n')}`)
+  return er
+}
 
-const stringify = val => typeof val === 'object' ? JSON.stringify(val) : String(val)
+const stringify = val => {
+  switch (typeof val) {
+    case 'string':
+    case 'number':
+    case 'object':
+      return JSON.stringify(val)
+    default: return String(val)
+  }
+}
 
 module.exports = Client
diff --git a/packages/core/config.js b/packages/core/config.js
index 127a141a31..1cfe7b6ff8 100644
--- a/packages/core/config.js
+++ b/packages/core/config.js
@@ -137,22 +137,13 @@ module.exports.schema = {
       isArray(value) && value.length === filter(value, s =>
         (typeof s === 'string' || (s && typeof s.test === 'function'))
       ).length
+  },
+  plugins: {
+    defaultValue: () => ([]),
+    message: 'should be an array of plugin objects',
+    validate: value =>
+      isArray(value) && value.length === filter(value, p =>
+        (p && typeof p === 'object' && typeof p.load === 'function')
+      ).length
   }
 }
-
-module.exports.mergeDefaults = (opts, schema) => {
-  if (!opts || !schema) throw new Error('opts and schema objects are required')
-  return reduce(keys(schema), (accum, key) => {
-    accum[key] = opts[key] !== undefined ? opts[key] : schema[key].defaultValue(opts[key], opts)
-    return accum
-  }, {})
-}
-
-module.exports.validate = (opts, schema) => {
-  if (!opts || !schema) throw new Error('opts and schema objects are required')
-  const errors = reduce(keys(schema), (accum, key) => {
-    if (schema[key].validate(opts[key], opts)) return accum
-    return accum.concat({ key, message: schema[key].message, value: opts[key] })
-  }, [])
-  return { valid: !errors.length, errors }
-}
diff --git a/packages/core/lib/clone-client.js b/packages/core/lib/clone-client.js
index c54a365569..5da2bef4df 100644
--- a/packages/core/lib/clone-client.js
+++ b/packages/core/lib/clone-client.js
@@ -1,7 +1,7 @@
 const assign = require('./es-utils/assign')
 
 module.exports = (client) => {
-  const clone = new client.Client({}, {}, client._notifier)
+  const clone = new client.Client({}, {}, [], client._notifier)
 
   clone._config = client._config
 
diff --git a/packages/core/test/client.test.ts b/packages/core/test/client.test.ts
index ab2461520c..6ac3a6a0a8 100644
--- a/packages/core/test/client.test.ts
+++ b/packages/core/test/client.test.ts
@@ -29,16 +29,18 @@ describe('@bugsnag/core/client', () => {
 
   describe('use()', () => {
     it('supports plugins', done => {
-      const client = new Client({ apiKey: '123' })
-      client.use({
-        name: 'test plugin',
-        // @ts-ignore
-        description: 'nothing much to see here',
-        init: (c) => {
-          expect(c).toEqual(client)
-          done()
-        }
+      let pluginClient
+      const client = new Client({
+        apiKey: '123',
+        plugins: [{
+          name: 'test plugin',
+          load: (c) => {
+            pluginClient = c
+            done()
+          }
+        }]
       })
+      expect(pluginClient).toEqual(client)
     })
   })
 
@@ -442,7 +444,7 @@ describe('@bugsnag/core/client', () => {
   })
 
   describe('startSession()', () => {
-    it('calls the provided the session delegate and return delegate’s return value', () => {
+    it('calls the provided session delegate and return delegate’s return value', () => {
       const client = new Client({ apiKey: 'API_KEY' })
       let ret
       client._sessionDelegate = {
diff --git a/packages/core/test/config.test.ts b/packages/core/test/config.test.ts
index bafa3c8dab..58d46af946 100644
--- a/packages/core/test/config.test.ts
+++ b/packages/core/test/config.test.ts
@@ -1,53 +1,6 @@
 import config from '../config'
 
 describe('@bugsnag/core/config', () => {
-  describe('validate()', () => {
-    it('needs opts/schema', () => {
-      expect(() => config.validate()).toThrow()
-      expect(() => config.validate({})).toThrow()
-    })
-
-    it('passes without errors', () => {
-      const validity = config.validate({}, { str: { validate: () => true, message: 'never valid' } })
-      expect(validity.valid).toBe(true)
-      expect(validity.errors[0]).toBe(undefined)
-    })
-
-    it('fails with errors', () => {
-      const validity = config.validate({}, { str: { validate: () => false, message: 'never valid' } })
-      expect(validity.valid).toBe(false)
-      expect(validity.errors[0]).toEqual({ key: 'str', message: 'never valid', value: undefined })
-    })
-  })
-
-  describe('mergeDefaults()', () => {
-    it('needs opts/schema', () => {
-      expect(() => config.mergeDefaults()).toThrow()
-      expect(() => config.mergeDefaults({})).toThrow()
-    })
-
-    it('merges correctly', () => {
-      const str = 'bugs bugs bugs'
-      const a = config.mergeDefaults({}, { str: { defaultValue: () => str } })
-      expect(a.str).toBe(str)
-
-      const b = config.mergeDefaults({ str }, { str: { defaultValue: () => 'not bugs' } })
-      expect(b.str).toBe(str)
-
-      const c = config.mergeDefaults({ str: '', bool: false }, {
-        str: { defaultValue: () => str },
-        bool: { defaultValue: () => true }
-      })
-      expect(c).toEqual({ str: '', bool: false })
-
-      const d = config.mergeDefaults({ str: undefined, bool: undefined }, {
-        str: { defaultValue: () => str },
-        bool: { defaultValue: () => true }
-      })
-      expect(d).toEqual({ str: str, bool: true })
-    })
-  })
-
   describe('schema', () => {
     it('has the required properties { validate(), defaultValue(), message }', () => {
       Object.keys(config.schema).forEach(k => {
diff --git a/packages/core/test/types.test.ts b/packages/core/test/types.test.ts
index d2cad459d1..5c1ab46bed 100644
--- a/packages/core/test/types.test.ts
+++ b/packages/core/test/types.test.ts
@@ -2,7 +2,7 @@ import Bugsnag, { Client, Config } from '..'
 
 // the client's constructor isn't public in TS so this drops down to JS to create one for the tests
 function createClient (opts: Config): Client {
-  const c = new (Bugsnag.Client as any)(opts, undefined, { name: 'Type Tests', version: 'nope', url: 'https://github.com/bugsnag/bugsnag-js' })
+  const c = new (Bugsnag.Client as any)(opts, undefined, [], { name: 'Type Tests', version: 'nope', url: 'https://github.com/bugsnag/bugsnag-js' })
   c._setDelivery(() => ({
     sendSession: (p: any, cb: () => void): void => { cb() },
     sendEvent: (p: any, cb: () => void): void => { cb() }
diff --git a/packages/core/types/client.d.ts b/packages/core/types/client.d.ts
index 2bdbf6eef1..6f846d8c9e 100644
--- a/packages/core/types/client.d.ts
+++ b/packages/core/types/client.d.ts
@@ -2,7 +2,6 @@ import Breadcrumb from './breadcrumb'
 import {
   NotifiableError,
   BreadcrumbType,
-  Plugin,
   OnErrorCallback,
   OnSessionCallback,
   OnBreadcrumbCallback,
@@ -64,7 +63,6 @@ declare class Client {
   public removeOnBreadcrumb(fn: OnBreadcrumbCallback): void;
 
   // plugins
-  public use(plugin: Plugin, ...args: any[]): Client;
   public getPlugin(name: string): any;
 
   // implemented on the browser notifier only
diff --git a/packages/core/types/common.d.ts b/packages/core/types/common.d.ts
index 3cf0354628..e3586edfec 100644
--- a/packages/core/types/common.d.ts
+++ b/packages/core/types/common.d.ts
@@ -14,8 +14,8 @@ export interface Config {
   }
   autoTrackSessions?: boolean
   context?: string
-  enabledBreadcrumbTypes?: BreadcrumbType[]
-  enabledReleaseStages?: string[]
+  enabledBreadcrumbTypes?: BreadcrumbType[] | null
+  enabledReleaseStages?: string[] | null
   endpoints?: { notify: string, sessions: string }
   redactedKeys?: Array<string | RegExp>
   onBreadcrumb?: OnBreadcrumbCallback | OnBreadcrumbCallback[]
@@ -26,6 +26,7 @@ export interface Config {
   metadata?: { [key: string]: any }
   releaseStage?: string
   user?: {} | null
+  plugins?: Plugin[]
 }
 
 export type OnErrorCallback = (event: Event, cb?: (err: null | Error) => void) => void | Promise<void> | boolean;
@@ -34,21 +35,10 @@ export type OnBreadcrumbCallback = (breadcrumb: Breadcrumb) => void | boolean;
 
 export interface Plugin {
   name?: string
-  init: (client: Client) => any
-  configSchema?: ConfigSchema
+  load: (client: Client) => any
   destroy?(): void
 }
 
-export interface ConfigSchemaEntry {
-  message: string
-  validate: (val: any) => boolean
-  defaultValue: () => any
-}
-
-export interface ConfigSchema {
-  [key: string]: ConfigSchemaEntry
-}
-
 export interface Logger {
   debug: (...args: any[]) => void
   info: (...args: any[]) => void
diff --git a/packages/expo/src/notifier.js b/packages/expo/src/notifier.js
index 31ebf483b5..2f76c204b5 100644
--- a/packages/expo/src/notifier.js
+++ b/packages/expo/src/notifier.js
@@ -13,27 +13,27 @@ const Breadcrumb = require('@bugsnag/core/breadcrumb')
 const delivery = require('@bugsnag/delivery-expo')
 
 const schema = { ...require('@bugsnag/core/config').schema, ...require('./config') }
+const BugsnagPluginReact = require('@bugsnag/plugin-react')
 
-const plugins = [
-  require('@bugsnag/plugin-react-native-global-error-handler'),
+// The NetInfo module makes requests to this URL to detect if the device is connected
+// to the internet. We don't want these requests to be recorded as breadcrumbs.
+// see https://github.com/react-native-community/react-native-netinfo/blob/d39b18c61e220d518d8403b6f4f4ab5bcc8c973c/src/index.ts#L16
+const NET_INFO_REACHABILITY_URL = 'https://clients3.google.com/generate_204'
+
+const internalPlugins = [
+  require('@bugsnag/plugin-react-native-global-error-handler')(),
   require('@bugsnag/plugin-react-native-unhandled-rejection'),
   require('@bugsnag/plugin-expo-device'),
   require('@bugsnag/plugin-expo-app'),
   require('@bugsnag/plugin-console-breadcrumbs'),
-  require('@bugsnag/plugin-network-breadcrumbs'),
+  require('@bugsnag/plugin-network-breadcrumbs')([NET_INFO_REACHABILITY_URL, Constants.manifest.logUrl]),
   require('@bugsnag/plugin-react-native-app-state-breadcrumbs'),
   require('@bugsnag/plugin-react-native-connectivity-breadcrumbs'),
   require('@bugsnag/plugin-react-native-orientation-breadcrumbs'),
-  require('@bugsnag/plugin-browser-session')
+  require('@bugsnag/plugin-browser-session'),
+  new BugsnagPluginReact(React)
 ]
 
-const bugsnagReact = require('@bugsnag/plugin-react')
-
-// The NetInfo module makes requests to this URL to detect if the device is connected
-// to the internet. We don't want these requests to be recorded as breadcrumbs.
-// see https://github.com/react-native-community/react-native-netinfo/blob/d39b18c61e220d518d8403b6f4f4ab5bcc8c973c/src/index.ts#L16
-const NET_INFO_REACHABILITY_URL = 'https://clients3.google.com/generate_204'
-
 const Bugsnag = {
   _client: null,
   createClient: (opts) => {
@@ -54,26 +54,10 @@ const Bugsnag = {
       opts.appVersion = Constants.manifest.version
     }
 
-    const bugsnag = new Client(opts, schema, { name, version, url })
+    const bugsnag = new Client(opts, schema, internalPlugins, { name, version, url })
 
     bugsnag._setDelivery(delivery)
 
-    plugins.forEach(pl => {
-      switch (pl.name) {
-        case 'networkBreadcrumbs':
-          bugsnag.use(pl, () => [
-            bugsnag._config.endpoints.notify,
-            bugsnag._config.endpoints.sessions,
-            Constants.manifest.logUrl,
-            NET_INFO_REACHABILITY_URL
-          ])
-          break
-        default:
-          bugsnag.use(pl)
-      }
-    })
-    bugsnag.use(bugsnagReact, React)
-
     bugsnag._logger.debug('Loaded!')
 
     return bugsnag._config.autoTrackSessions
diff --git a/packages/expo/types/test/fixtures/plugins.ts b/packages/expo/types/test/fixtures/plugins.ts
index 11d7ec6303..58b35cc114 100644
--- a/packages/expo/types/test/fixtures/plugins.ts
+++ b/packages/expo/types/test/fixtures/plugins.ts
@@ -1,7 +1,9 @@
 import Bugsnag from "../../..";
-Bugsnag.start('api_key');
-Bugsnag.use({
-  name: 'foobar',
-  init: client => 10
-})
+Bugsnag.start({
+  apiKey:'api_key',
+  plugins: [{
+    name: 'foobar',
+    load: client => 10
+  }]
+});
 console.log(Bugsnag.getPlugin('foo') === 10)
diff --git a/packages/node/src/notifier.js b/packages/node/src/notifier.js
index 7048cd753f..a0392a7aba 100644
--- a/packages/node/src/notifier.js
+++ b/packages/node/src/notifier.js
@@ -25,7 +25,7 @@ const pluginNodeUnhandledRejection = require('@bugsnag/plugin-node-unhandled-rej
 const pluginIntercept = require('@bugsnag/plugin-intercept')
 const pluginContextualize = require('@bugsnag/plugin-contextualize')
 
-const plugins = [
+const internalPlugins = [
   pluginSurroundingCode,
   pluginInProject,
   pluginStripProjectRoot,
@@ -44,12 +44,10 @@ const Bugsnag = {
     if (typeof opts === 'string') opts = { apiKey: opts }
     if (!opts) opts = {}
 
-    const bugsnag = new Client(opts, schema, { name, version, url })
+    const bugsnag = new Client(opts, schema, internalPlugins, { name, version, url })
 
     bugsnag._setDelivery(delivery)
 
-    plugins.forEach(pl => bugsnag.use(pl))
-
     bugsnag._logger.debug('Loaded!')
 
     bugsnag.leaveBreadcrumb = function () {
diff --git a/packages/plugin-angular/src/index.ts b/packages/plugin-angular/src/index.ts
index 720eb8c277..d2dd855834 100644
--- a/packages/plugin-angular/src/index.ts
+++ b/packages/plugin-angular/src/index.ts
@@ -41,7 +41,7 @@ export class BugsnagErrorHandler extends ErrorHandler {
 }
 
 const plugin: Plugin = {
-  init: (client: Client): ErrorHandler => {
+  load: (client: Client): ErrorHandler => {
     return new BugsnagErrorHandler(client)
   },
   name: 'Angular'
diff --git a/packages/plugin-browser-context/context.js b/packages/plugin-browser-context/context.js
index aac35dadcd..42dd661b5e 100644
--- a/packages/plugin-browser-context/context.js
+++ b/packages/plugin-browser-context/context.js
@@ -1,11 +1,11 @@
 /*
  * Sets the default context to be the current URL
  */
-module.exports = {
-  init: (client, win = window) => {
+module.exports = (win = window) => ({
+  load: (client) => {
     client.addOnError(event => {
       if (event.context !== undefined) return
       event.context = win.location.pathname
     }, true)
   }
-}
+})
diff --git a/packages/plugin-browser-context/test/context.test.js b/packages/plugin-browser-context/test/context.test.js
index 78ec6216ef..e8b595572c 100644
--- a/packages/plugin-browser-context/test/context.test.js
+++ b/packages/plugin-browser-context/test/context.test.js
@@ -12,9 +12,8 @@ const window = {
 
 describe('plugin: context', () => {
   it('sets client.context (and event.context) to window.location.pathname', done => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(window)])
     const payloads = []
-    client.use(plugin, window)
 
     client._setDelivery(client => ({
       sendEvent: (payload, cb) => {
@@ -33,9 +32,8 @@ describe('plugin: context', () => {
   })
 
   it('sets doesn’t overwrite an existing context', done => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(window)])
     const payloads = []
-    client.use(plugin, window)
 
     client.setContext('something else')
 
diff --git a/packages/plugin-browser-device/device.js b/packages/plugin-browser-device/device.js
index b4a3bf083c..7032899450 100644
--- a/packages/plugin-browser-device/device.js
+++ b/packages/plugin-browser-device/device.js
@@ -3,8 +3,8 @@ const assign = require('@bugsnag/core/lib/es-utils/assign')
 /*
  * Automatically detects browser device details
  */
-module.exports = {
-  init: (client, nav = navigator) => {
+module.exports = (nav = navigator) => ({
+  load: (client) => {
     const device = {
       locale: nav.browserLanguage || nav.systemLanguage || nav.userLanguage || nav.language,
       userAgent: nav.userAgent
@@ -23,4 +23,4 @@ module.exports = {
       )
     }, true)
   }
-}
+})
diff --git a/packages/plugin-browser-device/test/device.test.js b/packages/plugin-browser-device/test/device.test.js
index 09b4c8ca1d..22bdcd7e32 100644
--- a/packages/plugin-browser-device/test/device.test.js
+++ b/packages/plugin-browser-device/test/device.test.js
@@ -8,9 +8,8 @@ const navigator = { locale: 'en_GB', userAgent: 'testing browser 1.2.3' }
 
 describe('plugin: device', () => {
   it('should add an onError callback which captures device information', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(navigator)] })
     const payloads = []
-    client.use(plugin, navigator)
 
     expect(client._cbs.e.length).toBe(1)
 
@@ -25,14 +24,13 @@ describe('plugin: device', () => {
   })
 
   it('should add an onSession callback which captures device information', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(navigator)] })
     const payloads = []
     client._sessionDelegate = {
       startSession: (client, session) => {
         client._delivery.sendSession(session)
       }
     }
-    client.use(plugin, navigator)
 
     expect(client._cbs.s.length).toBe(1)
 
diff --git a/packages/plugin-browser-request/request.js b/packages/plugin-browser-request/request.js
index 77a8eaa6a5..83e18d771b 100644
--- a/packages/plugin-browser-request/request.js
+++ b/packages/plugin-browser-request/request.js
@@ -3,11 +3,11 @@ const assign = require('@bugsnag/core/lib/es-utils/assign')
 /*
  * Sets the event request: { url } to be the current href
  */
-module.exports = {
-  init: (client, win = window) => {
+module.exports = (win = window) => ({
+  load: (client) => {
     client.addOnError(event => {
       if (event.request && event.request.url) return
       event.request = assign({}, event.request, { url: win.location.href })
     }, true)
   }
-}
+})
diff --git a/packages/plugin-browser-request/test/request.test.js b/packages/plugin-browser-request/test/request.test.js
index 1e41397ce5..444eecbc71 100644
--- a/packages/plugin-browser-request/test/request.test.js
+++ b/packages/plugin-browser-request/test/request.test.js
@@ -8,9 +8,8 @@ const window = { location: { href: 'http://xyz.abc/foo/bar.html' } }
 
 describe('plugin: request', () => {
   it('sets event.request to window.location.href', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
     const payloads = []
-    client.use(plugin, window)
 
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
     client.notify(new Error('noooo'))
@@ -20,9 +19,8 @@ describe('plugin: request', () => {
   })
 
   it('sets doesn’t overwrite an existing request', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
     const payloads = []
-    client.use(plugin, window)
 
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
     client.notify(new Error('noooo'), event => {
diff --git a/packages/plugin-browser-session/session.js b/packages/plugin-browser-session/session.js
index fcbe5ec703..0313debe43 100644
--- a/packages/plugin-browser-session/session.js
+++ b/packages/plugin-browser-session/session.js
@@ -1,7 +1,7 @@
 const includes = require('@bugsnag/core/lib/es-utils/includes')
 
 module.exports = {
-  init: client => { client._sessionDelegate = sessionDelegate }
+  load: client => { client._sessionDelegate = sessionDelegate }
 }
 
 const sessionDelegate = {
diff --git a/packages/plugin-browser-session/test/session.test.js b/packages/plugin-browser-session/test/session.test.js
index 07695beaac..7e62adef5a 100644
--- a/packages/plugin-browser-session/test/session.test.js
+++ b/packages/plugin-browser-session/test/session.test.js
@@ -1,4 +1,4 @@
-const { describe, it, expect } = global
+const { describe, it, expect, spyOn } = global
 
 const plugin = require('../')
 
@@ -7,8 +7,7 @@ const VALID_NOTIFIER = { name: 't', version: '0', url: 'http://' }
 
 describe('plugin: sessions', () => {
   it('notifies the session endpoint', (done) => {
-    const c = new Client({ apiKey: 'API_KEY' }, undefined, VALID_NOTIFIER)
-    c.use(plugin)
+    const c = new Client({ apiKey: 'API_KEY' }, undefined, [plugin], VALID_NOTIFIER)
     c._setDelivery(client => ({
       sendSession: (session, cb) => {
         expect(typeof session).toBe('object')
@@ -24,9 +23,8 @@ describe('plugin: sessions', () => {
   })
 
   it('tracks handled/unhandled error counts and sends them in error payloads', (done) => {
-    const c = new Client({ apiKey: 'API_KEY' })
+    const c = new Client({ apiKey: 'API_KEY' }, undefined, [plugin], VALID_NOTIFIER)
     let i = 0
-    c.use(plugin)
     c._setDelivery(client => ({
       sendSession: () => {},
       sendEvent: (payload, cb) => {
@@ -52,8 +50,8 @@ describe('plugin: sessions', () => {
   })
 
   it('correctly infers releaseStage', (done) => {
-    const c = new Client({ apiKey: 'API_KEY', releaseStage: 'foo' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'API_KEY', releaseStage: 'foo' }, undefined, [plugin], VALID_NOTIFIER)
+
     c._setDelivery(client => ({
       sendSession: (session, cb) => {
         expect(typeof session).toBe('object')
@@ -65,8 +63,7 @@ describe('plugin: sessions', () => {
   })
 
   it('doesn’t send when releaseStage is not in enabledReleaseStages', (done) => {
-    const c = new Client({ apiKey: 'API_KEY', releaseStage: 'foo', enabledReleaseStages: ['baz'] })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'API_KEY', releaseStage: 'foo', enabledReleaseStages: ['baz'] }, undefined, [plugin], VALID_NOTIFIER)
     c._setDelivery(client => ({
       sendSession: (session, cb) => {
         expect(true).toBe(false)
@@ -76,26 +73,25 @@ describe('plugin: sessions', () => {
     setTimeout(done, 150)
   })
 
-  it('rejects config when session endpoint is not set', () => {
-    expect(() => {
-      const c = new Client({
-        apiKey: 'API_KEY',
-        releaseStage: 'foo',
-        endpoints: { notify: '/foo' },
-        autoTrackSessions: false
-      })
-      expect(c).toBe(c)
-    }).toThrowError(
-      /"endpoints" should be an object containing endpoint URLs { notify, sessions }/
-    )
+  it('uses default endpoints when session endpoint is not set', () => {
+    const logger = { debug: () => {}, info: () => {}, warn: () => {}, error: () => {} }
+    const warnSpy = spyOn(logger, 'warn')
+    const c = new Client({
+      apiKey: 'API_KEY',
+      releaseStage: 'foo',
+      endpoints: { notify: '/foo' },
+      autoTrackSessions: false,
+      logger
+    }, undefined, [plugin], VALID_NOTIFIER)
+    expect(c._config.endpoints.sessions).toBe('https://sessions.bugsnag.com')
+    expect(warnSpy.calls.first().args[0].message).toBe('Invalid configuration\n  - endpoints should be an object containing endpoint URLs { notify, sessions }, got {"notify":"/foo"}')
   })
 
   it('supports pausing and resuming sessions', (done) => {
     const payloads = []
     const c = new Client({
       apiKey: 'API_KEY'
-    })
-    c.use(plugin)
+    }, undefined, [plugin], VALID_NOTIFIER)
     c._setDelivery(client => ({
       sendEvent: (p, cb = () => {}) => {
         payloads.push(p)
diff --git a/packages/plugin-client-ip/client-ip.js b/packages/plugin-client-ip/client-ip.js
index 8ad1cff853..0e4b7e9de1 100644
--- a/packages/plugin-client-ip/client-ip.js
+++ b/packages/plugin-client-ip/client-ip.js
@@ -4,7 +4,7 @@ const assign = require('@bugsnag/core/lib/es-utils/assign')
  * Prevent collection of user IPs
  */
 module.exports = {
-  init: (client) => {
+  load: (client) => {
     if (client._config.collectUserIp) return
 
     client.addOnError(event => {
diff --git a/packages/plugin-client-ip/test/client-ip.test.js b/packages/plugin-client-ip/test/client-ip.test.js
index 4b99f5d925..e7eb4835a3 100644
--- a/packages/plugin-client-ip/test/client-ip.test.js
+++ b/packages/plugin-client-ip/test/client-ip.test.js
@@ -6,9 +6,8 @@ const Client = require('@bugsnag/core/client')
 
 describe('plugin: ip', () => {
   it('does nothing when collectUserIp=true', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin])
     const payloads = []
-    client.use(plugin)
 
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
     client.notify(new Error('noooo'), event => { event.request = { some: 'detail' } })
@@ -18,9 +17,8 @@ describe('plugin: ip', () => {
   })
 
   it('doesn’t overwrite an existing user id', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH', collectUserIp: false })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', collectUserIp: false }, undefined, [plugin])
     const payloads = []
-    client.use(plugin)
 
     client._user = { id: 'foobar' }
 
@@ -33,9 +31,8 @@ describe('plugin: ip', () => {
   })
 
   it('overwrites a user id if it is explicitly `undefined`', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH', collectUserIp: false })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', collectUserIp: false }, undefined, [plugin])
     const payloads = []
-    client.use(plugin)
 
     client._user = { id: undefined }
 
@@ -48,9 +45,8 @@ describe('plugin: ip', () => {
   })
 
   it('redacts user IP if none is provided', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH', collectUserIp: false })
+    const client = new Client({ apiKey: 'API_KEY_YEAH', collectUserIp: false }, undefined, [plugin])
     const payloads = []
-    client.use(plugin)
 
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
     client.notify(new Error('noooo'))
diff --git a/packages/plugin-console-breadcrumbs/console-breadcrumbs.js b/packages/plugin-console-breadcrumbs/console-breadcrumbs.js
index 4c7084b803..cf4aeeccc4 100644
--- a/packages/plugin-console-breadcrumbs/console-breadcrumbs.js
+++ b/packages/plugin-console-breadcrumbs/console-breadcrumbs.js
@@ -6,7 +6,7 @@ const includes = require('@bugsnag/core/lib/es-utils/includes')
 /*
  * Leaves breadcrumbs when console log methods are called
  */
-exports.init = (client) => {
+exports.load = (client) => {
   const isDev = /^dev(elopment)?$/.test(client._config.releaseStage)
 
   if (!client._config.enabledBreadcrumbTypes || !includes(client._config.enabledBreadcrumbTypes, 'log') || isDev) return
diff --git a/packages/plugin-console-breadcrumbs/test/console-breadcrumbs.test.js b/packages/plugin-console-breadcrumbs/test/console-breadcrumbs.test.js
index 53b795ce39..5997c12f0b 100644
--- a/packages/plugin-console-breadcrumbs/test/console-breadcrumbs.test.js
+++ b/packages/plugin-console-breadcrumbs/test/console-breadcrumbs.test.js
@@ -6,8 +6,7 @@ const Client = require('@bugsnag/core/client')
 
 describe('plugin: console breadcrumbs', () => {
   it('should leave a breadcrumb when console.log() is called', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin] })
     console.log('check 1, 2')
     // make sure it's null-safe
     console.log(null)
@@ -30,8 +29,7 @@ describe('plugin: console breadcrumbs', () => {
   })
 
   it('should not throw when an object without toString is logged', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin] })
     expect(() => console.log(Object.create(null))).not.toThrow()
     expect(c._breadcrumbs.length).toBe(1)
     expect(c._breadcrumbs[0].message).toBe('Console output')
@@ -40,24 +38,21 @@ describe('plugin: console breadcrumbs', () => {
   })
 
   it('should not be enabled when enabledBreadcrumbTypes=[]', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [plugin] })
     console.log(123)
     expect(c._breadcrumbs.length).toBe(0)
     plugin.destroy()
   })
 
   it('should be enabled when enabledBreadcrumbTypes=["log"]', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['log'] })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['log'], plugins: [plugin] })
     console.log(123)
     expect(c._breadcrumbs.length).toBe(1)
     plugin.destroy()
   })
 
   it('should be not enabled by default when releaseStage=development', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', releaseStage: 'development' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', releaseStage: 'development', plugins: [plugin] })
     console.log(123)
     expect(c._breadcrumbs.length).toBe(0)
     plugin.destroy()
diff --git a/packages/plugin-contextualize/contextualize.js b/packages/plugin-contextualize/contextualize.js
index 1eb236c853..65008e9dd0 100644
--- a/packages/plugin-contextualize/contextualize.js
+++ b/packages/plugin-contextualize/contextualize.js
@@ -4,7 +4,7 @@ const { getStack, maybeUseFallbackStack } = require('@bugsnag/core/lib/node-fall
 
 module.exports = {
   name: 'contextualize',
-  init: client => {
+  load: client => {
     const contextualize = (fn, onError) => {
       // capture a stacktrace in case a resulting error has nothing
       const fallbackStack = getStack()
diff --git a/packages/plugin-contextualize/test/contextualize.test.js b/packages/plugin-contextualize/test/contextualize.test.js
index 37a0556b74..fc79c7aefb 100644
--- a/packages/plugin-contextualize/test/contextualize.test.js
+++ b/packages/plugin-contextualize/test/contextualize.test.js
@@ -25,7 +25,8 @@ describe('plugin: contextualize', () => {
       onUncaughtException: (err) => {
         expect(err.message).toBe('no item available')
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUncaughtException: {
@@ -47,7 +48,6 @@ describe('plugin: contextualize', () => {
       },
       sendSession: () => {}
     }))
-    c.use(plugin)
     const contextualize = c.getPlugin('contextualize')
     contextualize(() => {
       load(8, (err) => {
@@ -64,7 +64,8 @@ describe('plugin: contextualize', () => {
       apiKey: 'api_key',
       onUncaughtException: () => {
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUncaughtException: {
@@ -81,7 +82,6 @@ describe('plugin: contextualize', () => {
       },
       sendSession: () => {}
     }))
-    c.use(plugin)
     const contextualize = c.getPlugin('contextualize')
     contextualize(() => {
       fs.createReadStream('does not exist')
@@ -94,7 +94,8 @@ describe('plugin: contextualize', () => {
       onUncaughtException: (err) => {
         expect(err.message).toBe('no item available')
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUncaughtException: {
@@ -109,7 +110,6 @@ describe('plugin: contextualize', () => {
       },
       sendSession: () => {}
     }))
-    c.use(plugin)
     const contextualize = c.getPlugin('contextualize')
     contextualize(() => {
       load(8, (err) => {
diff --git a/packages/plugin-expo-app/app.js b/packages/plugin-expo-app/app.js
index 90f39ef5af..67afc36246 100644
--- a/packages/plugin-expo-app/app.js
+++ b/packages/plugin-expo-app/app.js
@@ -4,7 +4,7 @@ const { AppState } = require('react-native')
 const appStart = new Date()
 
 module.exports = {
-  init: client => {
+  load: client => {
     let lastEnteredForeground = appStart
     let lastState = AppState.currentState
 
diff --git a/packages/plugin-expo-app/test/app.test.js b/packages/plugin-expo-app/test/app.test.js
index 6af76bf157..0099d179c0 100644
--- a/packages/plugin-expo-app/test/app.test.js
+++ b/packages/plugin-expo-app/test/app.test.js
@@ -22,9 +22,8 @@ describe('plugin: expo app', () => {
         }
       }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
 
-    c.use(plugin)
     c._setDelivery(client => ({
       sendEvent: (payload) => {
         const r = JSON.parse(JSON.stringify(payload))
@@ -55,9 +54,8 @@ describe('plugin: expo app', () => {
         }
       }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
 
-    c.use(plugin)
     c._setDelivery(client => ({
       sendEvent: (payload) => {
         const r = JSON.parse(JSON.stringify(payload))
@@ -88,9 +86,8 @@ describe('plugin: expo app', () => {
         }
       }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
 
-    c.use(plugin)
     c._setDelivery(client => ({
       sendEvent: (payload) => {
         const r = JSON.parse(JSON.stringify(payload))
@@ -119,9 +116,8 @@ describe('plugin: expo app', () => {
       },
       'react-native': { AppState }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
 
-    c.use(plugin)
     expect(typeof listener).toBe('function')
     const events = []
     c._setDelivery(client => ({
diff --git a/packages/plugin-expo-device/device.js b/packages/plugin-expo-device/device.js
index 0a024dacd1..d55e3ab65e 100644
--- a/packages/plugin-expo-device/device.js
+++ b/packages/plugin-expo-device/device.js
@@ -3,7 +3,7 @@ const { Dimensions, Platform } = require('react-native')
 const rnVersion = require('react-native/package.json').version
 
 module.exports = {
-  init: client => {
+  load: client => {
     let orientation
     const updateOrientation = () => {
       const { height, width } = Dimensions.get('screen')
diff --git a/packages/plugin-expo-device/test/device.test.js b/packages/plugin-expo-device/test/device.test.js
index 15b01e1ed4..b248eae4c2 100644
--- a/packages/plugin-expo-device/test/device.test.js
+++ b/packages/plugin-expo-device/test/device.test.js
@@ -30,7 +30,7 @@ describe('plugin: expo device', () => {
       },
       'react-native/package.json': { version: REACT_NATIVE_VERSION }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const before = (new Date()).toISOString()
     c._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -51,7 +51,6 @@ describe('plugin: expo device', () => {
         done()
       }
     }))
-    c.use(plugin)
     c.notify(new Error('device testing'))
   })
 
@@ -81,7 +80,7 @@ describe('plugin: expo device', () => {
       },
       'react-native/package.json': { version: REACT_NATIVE_VERSION }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const before = (new Date()).toISOString()
     c._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -103,7 +102,6 @@ describe('plugin: expo device', () => {
         done()
       }
     }))
-    c.use(plugin)
     c.notify(new Error('device testing'))
   })
 
@@ -154,7 +152,7 @@ describe('plugin: expo device', () => {
       },
       'react-native/package.json': { version: REACT_NATIVE_VERSION }
     })
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const events = []
     c._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -169,7 +167,6 @@ describe('plugin: expo device', () => {
         }
       }
     }))
-    c.use(plugin)
     expect(d._listeners.change.length).toBe(1)
     c.notify(new Error('device testing'))
     d._set(1024, 768)
diff --git a/packages/plugin-express/src/express.js b/packages/plugin-express/src/express.js
index caefbbe5bf..a83e2f3ed2 100644
--- a/packages/plugin-express/src/express.js
+++ b/packages/plugin-express/src/express.js
@@ -13,7 +13,7 @@ const handledState = {
 
 module.exports = {
   name: 'express',
-  init: client => {
+  load: client => {
     const requestHandler = (req, res, next) => {
       const dom = domain.create()
 
diff --git a/packages/plugin-express/test/express.test.js b/packages/plugin-express/test/express.test.js
index 83ba8e5dd3..c786ed1d15 100644
--- a/packages/plugin-express/test/express.test.js
+++ b/packages/plugin-express/test/express.test.js
@@ -6,8 +6,7 @@ const plugin = require('../')
 
 describe('plugin: express', () => {
   it('exports two middleware functions', () => {
-    const c = new Client({ apiKey: 'api_key' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const middleware = c.getPlugin('express')
     expect(typeof middleware.requestHandler).toBe('function')
     expect(middleware.requestHandler.length).toBe(3)
diff --git a/packages/plugin-inline-script-content/inline-script-content.js b/packages/plugin-inline-script-content/inline-script-content.js
index f1fb76d5f5..e60952d6ea 100644
--- a/packages/plugin-inline-script-content/inline-script-content.js
+++ b/packages/plugin-inline-script-content/inline-script-content.js
@@ -5,8 +5,8 @@ const filter = require('@bugsnag/core/lib/es-utils/filter')
 const MAX_LINE_LENGTH = 200
 const MAX_SCRIPT_LENGTH = 500000
 
-module.exports = {
-  init: (client, doc = document, win = window) => {
+module.exports = (doc = document, win = window) => ({
+  load: (client) => {
     if (!client._config.trackInlineScripts) return
 
     const originalLocation = win.location.href
@@ -167,7 +167,7 @@ module.exports = {
       message: 'should be true|false'
     }
   }
-}
+})
 
 function __proxy (host, name, replacer) {
   const original = host[name]
diff --git a/packages/plugin-inline-script-content/test/inline-script-content.test.js b/packages/plugin-inline-script-content/test/inline-script-content.test.js
index 386e5573bc..2f3f8b8216 100644
--- a/packages/plugin-inline-script-content/test/inline-script-content.test.js
+++ b/packages/plugin-inline-script-content/test/inline-script-content.test.js
@@ -28,9 +28,8 @@ Lorem ipsum dolor sit amet.
     }
     const window = { location: { href: 'https://app.bugsnag.com/errors' } }
 
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
     const payloads = []
-    client.use(plugin, document, window)
 
     expect(client._cbs.e.length).toBe(1)
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
@@ -47,12 +46,12 @@ Lorem ipsum dolor sit amet.
     const prevHandler = () => { done() }
     const document = { documentElement: { outerHTML: '' }, onreadystatechange: prevHandler }
     const window = { location: { href: 'https://app.bugsnag.com/errors' }, document }
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
-    client.use(plugin, document, window)
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
     // check it installed a new onreadystatechange handler
     expect(document.onreadystatechange === prevHandler).toBe(false)
     // now check it calls the previous one
     document.onreadystatechange()
+    expect(client).toBe(client)
   })
 
   it('does no wrapping of global functions when disabled', () => {
@@ -62,10 +61,10 @@ Lorem ipsum dolor sit amet.
     function EventTarget () {}
     EventTarget.prototype.addEventListener = addEventListener
     window.EventTarget = EventTarget
-    const client = new Client({ apiKey: 'API_KEY_YEAH', trackInlineScripts: false })
-    client.use(plugin, document, window)
+    const client = new Client({ apiKey: 'API_KEY_YEAH', trackInlineScripts: false }, undefined, [plugin(document, window)])
     // check the addEventListener function was not wrapped
     expect(window.EventTarget.prototype.addEventListener).toBe(addEventListener)
+    expect(client).toBe(client)
   })
 
   it('truncates script content to a reasonable length', () => {
@@ -92,9 +91,8 @@ Lorem ipsum dolor sit amet.
     }
     const window = { location: { href: 'https://app.bugsnag.com/errors' } }
 
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
     const payloads = []
-    client.use(plugin, document, window)
 
     expect(client._cbs.e.length).toBe(1)
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
@@ -129,9 +127,8 @@ Lorem ipsum dolor sit amet.
     }
     const window = { location: { href: 'https://app.bugsnag.com/errors' } }
 
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
     const payloads = []
-    client.use(plugin, document, window)
 
     expect(client._cbs.e.length).toBe(1)
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
@@ -165,9 +162,8 @@ Lorem ipsum dolor sit amet.
     }
     const window = { location: { href: 'https://app.bugsnag.com/errors' } }
 
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
     const payloads = []
-    client.use(plugin, document, window)
 
     expect(client._cbs.e.length).toBe(1)
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
@@ -210,11 +206,11 @@ Lorem ipsum dolor sit amet.
     window.addEventListener('click', myfun)
 
     const spy = spyOn(Window.prototype, 'removeEventListener')
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
-    client.use(plugin, document, window)
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
 
     window.removeEventListener('click', myfun)
     expect(spy).toHaveBeenCalledTimes(2)
+    expect(client).toBe(client)
   })
 
   it('gets the correct line numbers for errors at the start of the document', () => {
@@ -228,9 +224,8 @@ Lorem ipsum dolor sit amet.
     }
     const window = { location: { href: 'https://app.bugsnag.com/errors' } }
 
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const client = new Client({ apiKey: 'API_KEY_YEAH' }, undefined, [plugin(document, window)])
     const payloads = []
-    client.use(plugin, document, window)
 
     expect(client._cbs.e.length).toBe(1)
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
diff --git a/packages/plugin-interaction-breadcrumbs/interaction-breadcrumbs.js b/packages/plugin-interaction-breadcrumbs/interaction-breadcrumbs.js
index 109786d4d7..7195892e16 100644
--- a/packages/plugin-interaction-breadcrumbs/interaction-breadcrumbs.js
+++ b/packages/plugin-interaction-breadcrumbs/interaction-breadcrumbs.js
@@ -3,8 +3,8 @@ const includes = require('@bugsnag/core/lib/es-utils/includes')
 /*
  * Leaves breadcrumbs when the user interacts with the DOM
  */
-module.exports = {
-  init: (client, win = window) => {
+module.exports = (win = window) => ({
+  load: (client) => {
     if (!('addEventListener' in win)) return
 
     if (!client._config.enabledBreadcrumbTypes || !includes(client._config.enabledBreadcrumbTypes, 'user')) return
@@ -22,7 +22,7 @@ module.exports = {
       client.leaveBreadcrumb('UI click', { targetText, targetSelector }, 'user')
     }, true)
   }
-}
+})
 
 // extract text content from a element
 const getNodeText = el => {
diff --git a/packages/plugin-interaction-breadcrumbs/test/interaction-breadcrumbs.test.js b/packages/plugin-interaction-breadcrumbs/test/interaction-breadcrumbs.test.js
index 201c7dfc3c..7b6ee3000e 100644
--- a/packages/plugin-interaction-breadcrumbs/test/interaction-breadcrumbs.test.js
+++ b/packages/plugin-interaction-breadcrumbs/test/interaction-breadcrumbs.test.js
@@ -6,25 +6,22 @@ const Client = require('@bugsnag/core/client')
 
 describe('plugin: interaction breadcrumbs', () => {
   it('should drop a breadcrumb when an element is clicked', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
     const { window, winHandlers, els } = getMockWindow()
-    c.use(plugin, window)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin(window)] })
     winHandlers.click.forEach(fn => fn.call(window, { target: els[0] }))
     expect(c._breadcrumbs.length).toBe(1)
   })
 
   it('should not be enabled when enabledBreadcrumbTypes=[]', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
     const { window, winHandlers, els } = getMockWindow()
-    c.use(plugin, window)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [plugin(window)] })
     winHandlers.click.forEach(fn => fn.call(window, { target: els[0] }))
     expect(c._breadcrumbs.length).toBe(0)
   })
 
   it('should be enabled when enabledBreadcrumbTypes=["user"]', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['user'] })
     const { window, winHandlers, els } = getMockWindow()
-    c.use(plugin, window)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['user'], plugins: [plugin(window)] })
     winHandlers.click.forEach(fn => fn.call(window, { target: els[0] }))
     expect(c._breadcrumbs.length).toBe(1)
   })
diff --git a/packages/plugin-intercept/intercept.js b/packages/plugin-intercept/intercept.js
index 8cd78df5fa..1cd921981e 100644
--- a/packages/plugin-intercept/intercept.js
+++ b/packages/plugin-intercept/intercept.js
@@ -2,7 +2,7 @@ const { getStack, maybeUseFallbackStack } = require('@bugsnag/core/lib/node-fall
 
 module.exports = {
   name: 'intercept',
-  init: client => {
+  load: client => {
     const intercept = (onError = () => {}, cb) => {
       if (typeof cb !== 'function') {
         cb = onError
diff --git a/packages/plugin-intercept/test/intercept.test.js b/packages/plugin-intercept/test/intercept.test.js
index c1d62a210d..a0352ee274 100644
--- a/packages/plugin-intercept/test/intercept.test.js
+++ b/packages/plugin-intercept/test/intercept.test.js
@@ -30,12 +30,11 @@ function pload (index, cb) {
 
 describe('plugin: intercept', () => {
   it('does nothing with a happy-case callback', done => {
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     c._setDelivery(client => ({
       sendEvent: () => expect(true).toBe(false),
       sendSession: () => {}
     }))
-    c.use(plugin)
     const intercept = c.getPlugin('intercept')
     load(1, intercept((item) => {
       expect(item).toBe('b')
@@ -44,7 +43,7 @@ describe('plugin: intercept', () => {
   })
 
   it('sends an event when the callback recieves an error', done => {
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     c._setDelivery(client => ({
       sendEvent: (payload) => {
         expect(payload.events[0].errors[0].errorMessage).toBe('no item available')
@@ -52,7 +51,6 @@ describe('plugin: intercept', () => {
       },
       sendSession: () => {}
     }))
-    c.use(plugin)
     const intercept = c.getPlugin('intercept')
     load(4, intercept((item) => {
       expect(true).toBe(false)
@@ -61,12 +59,11 @@ describe('plugin: intercept', () => {
   })
 
   it('works with resolved promises', done => {
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     c._setDelivery(client => ({
       sendEvent: () => expect(true).toBe(false),
       sendSession: () => {}
     }))
-    c.use(plugin)
     const intercept = c.getPlugin('intercept')
     pload(0).then(item => {
       expect(item).toBe('a')
@@ -75,7 +72,7 @@ describe('plugin: intercept', () => {
   })
 
   it('works with rejected promises', done => {
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     c._setDelivery(client => ({
       sendEvent: (payload) => {
         expect(payload.events[0].errors[0].errorMessage).toBe('no item available')
@@ -83,7 +80,6 @@ describe('plugin: intercept', () => {
       },
       sendSession: () => {}
     }))
-    c.use(plugin)
     const intercept = c.getPlugin('intercept')
     pload(7).then(item => {
       expect(true).toBe(false)
@@ -92,7 +88,7 @@ describe('plugin: intercept', () => {
   })
 
   it('should add a stacktrace when missing', done => {
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     c._setDelivery(client => ({
       sendEvent: (payload, cb) => {
         expect(payload.events[0].errors[0].errorMessage).toBe('ENOENT: no such file or directory, open \'does not exist\'')
@@ -102,7 +98,6 @@ describe('plugin: intercept', () => {
       },
       sendSession: () => {}
     }))
-    c.use(plugin)
     const intercept = c.getPlugin('intercept')
     fs.readFile('does not exist', intercept(data => {
       expect(true).toBe(false)
diff --git a/packages/plugin-koa/src/koa.js b/packages/plugin-koa/src/koa.js
index c630ea5698..4c9daf4f82 100644
--- a/packages/plugin-koa/src/koa.js
+++ b/packages/plugin-koa/src/koa.js
@@ -12,7 +12,7 @@ const handledState = {
 
 module.exports = {
   name: 'koa',
-  init: client => {
+  load: client => {
     const requestHandler = async (ctx, next) => {
       // Get a client to be scoped to this request. If sessions are enabled, use the
       // startSession() call to get a session client, otherwise, clone the existing client.
diff --git a/packages/plugin-koa/test/koa.test.js b/packages/plugin-koa/test/koa.test.js
index 61c07429a3..f56435a79c 100644
--- a/packages/plugin-koa/test/koa.test.js
+++ b/packages/plugin-koa/test/koa.test.js
@@ -6,13 +6,12 @@ const plugin = require('../')
 
 describe('plugin: koa', () => {
   it('exports two middleware functions', () => {
-    const c = new Client({ apiKey: 'api_key' })
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     c._sessionDelegate = {
       startSession: () => c,
       pauseSession: () => {},
       resumeSession: () => {}
     }
-    c.use(plugin)
     const middleware = c.getPlugin('koa')
     expect(typeof middleware.requestHandler).toBe('function')
     expect(middleware.requestHandler.length).toBe(2)
@@ -22,13 +21,13 @@ describe('plugin: koa', () => {
 
   describe('requestHandler', () => {
     it('should call through to app.onerror to ensure the error is logged out', (done) => {
-      const c = new Client({ apiKey: 'api_key' })
+      const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
       c._sessionDelegate = {
         startSession: () => c,
         pauseSession: () => {},
         resumeSession: () => {}
       }
-      c.use(plugin)
+
       const middleware = c.getPlugin('koa')
       const mockCtx = {
         req: { connection: { address: () => ({ port: 1234 }) }, headers: {} },
diff --git a/packages/plugin-navigation-breadcrumbs/navigation-breadcrumbs.js b/packages/plugin-navigation-breadcrumbs/navigation-breadcrumbs.js
index 1a7780811a..4456dfd6f6 100644
--- a/packages/plugin-navigation-breadcrumbs/navigation-breadcrumbs.js
+++ b/packages/plugin-navigation-breadcrumbs/navigation-breadcrumbs.js
@@ -1,38 +1,51 @@
 const includes = require('@bugsnag/core/lib/es-utils/includes')
 
 /*
- * Leaves breadcrumbs when navigation methods are called or events are emitted
- */
-exports.init = (client, win = window) => {
-  if (!('addEventListener' in win)) return
+* Leaves breadcrumbs when navigation methods are called or events are emitted
+*/
+module.exports = (win = window) => {
+  const plugin = {
+    load: (client) => {
+      if (!('addEventListener' in win)) return
 
-  if (!client._config.enabledBreadcrumbTypes || !includes(client._config.enabledBreadcrumbTypes, 'navigation')) return
+      if (!client._config.enabledBreadcrumbTypes || !includes(client._config.enabledBreadcrumbTypes, 'navigation')) return
 
-  // returns a function that will drop a breadcrumb with a given name
-  const drop = name => () => client.leaveBreadcrumb(name, {}, 'navigation')
+      // returns a function that will drop a breadcrumb with a given name
+      const drop = name => () => client.leaveBreadcrumb(name, {}, 'navigation')
 
-  // simple drops – just names, no meta
-  win.addEventListener('pagehide', drop('Page hidden'), true)
-  win.addEventListener('pageshow', drop('Page shown'), true)
-  win.addEventListener('load', drop('Page loaded'), true)
-  win.document.addEventListener('DOMContentLoaded', drop('DOMContentLoaded'), true)
-  // some browsers like to emit popstate when the page loads, so only add the popstate listener after that
-  win.addEventListener('load', () => win.addEventListener('popstate', drop('Navigated back'), true))
+      // simple drops – just names, no meta
+      win.addEventListener('pagehide', drop('Page hidden'), true)
+      win.addEventListener('pageshow', drop('Page shown'), true)
+      win.addEventListener('load', drop('Page loaded'), true)
+      win.document.addEventListener('DOMContentLoaded', drop('DOMContentLoaded'), true)
+      // some browsers like to emit popstate when the page loads, so only add the popstate listener after that
+      win.addEventListener('load', () => win.addEventListener('popstate', drop('Navigated back'), true))
 
-  // hashchange has some metadata that we care about
-  win.addEventListener('hashchange', event => {
-    const metadata = event.oldURL
-      ? { from: relativeLocation(event.oldURL, win), to: relativeLocation(event.newURL, win), state: getCurrentState(win) }
-      : { to: relativeLocation(win.location.href, win) }
-    client.leaveBreadcrumb('Hash changed', metadata, 'navigation')
-  }, true)
+      // hashchange has some metadata that we care about
+      win.addEventListener('hashchange', event => {
+        const metadata = event.oldURL
+          ? { from: relativeLocation(event.oldURL, win), to: relativeLocation(event.newURL, win), state: getCurrentState(win) }
+          : { to: relativeLocation(win.location.href, win) }
+        client.leaveBreadcrumb('Hash changed', metadata, 'navigation')
+      }, true)
 
-  // the only way to know about replaceState/pushState is to wrap them… >_<
+      // the only way to know about replaceState/pushState is to wrap them… >_<
 
-  if (win.history.replaceState) wrapHistoryFn(client, win.history, 'replaceState', win)
-  if (win.history.pushState) wrapHistoryFn(client, win.history, 'pushState', win)
+      if (win.history.replaceState) wrapHistoryFn(client, win.history, 'replaceState', win)
+      if (win.history.pushState) wrapHistoryFn(client, win.history, 'pushState', win)
 
-  client.leaveBreadcrumb('Bugsnag loaded', {}, 'navigation')
+      client.leaveBreadcrumb('Bugsnag loaded', {}, 'navigation')
+    }
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    plugin.destroy = (win = window) => {
+      win.history.replaceState._restore()
+      win.history.pushState._restore()
+    }
+  }
+
+  return plugin
 }
 
 if (process.env.NODE_ENV !== 'production') {
diff --git a/packages/plugin-navigation-breadcrumbs/test/navigation-breadcrumbs.test.js b/packages/plugin-navigation-breadcrumbs/test/navigation-breadcrumbs.test.js
index 53ac4bbeb0..8e6d0a835e 100644
--- a/packages/plugin-navigation-breadcrumbs/test/navigation-breadcrumbs.test.js
+++ b/packages/plugin-navigation-breadcrumbs/test/navigation-breadcrumbs.test.js
@@ -6,15 +6,14 @@ const Client = require('@bugsnag/core/client')
 
 describe('plugin: navigation breadcrumbs', () => {
   it('should drop breadcrumb for navigational activity', done => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
+    const { winHandlers, docHandlers, window } = getMockWindow()
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin(window)] })
     c._sessionDelegate = {
       startSession: () => {},
       pauseSession: () => {},
       resumeSession: () => {}
     }
 
-    const { winHandlers, docHandlers, window } = getMockWindow()
-    c.use(plugin, window)
     winHandlers.load.forEach((h) => h.call(window))
     docHandlers.DOMContentLoaded.forEach((h) => h.call(window.document))
 
@@ -37,14 +36,13 @@ describe('plugin: navigation breadcrumbs', () => {
   })
 
   it('should not be enabled when enabledBreadcrumbTypes=[]', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
+    const { winHandlers, docHandlers, window } = getMockWindow()
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [plugin(window)] })
     c._sessionDelegate = {
       startSession: () => {},
       pauseSession: () => {},
       resumeSession: () => {}
     }
-    const { winHandlers, docHandlers, window } = getMockWindow()
-    c.use(plugin, window)
     winHandlers.load.forEach((h) => h.call(window))
     docHandlers.DOMContentLoaded.forEach((h) => h.call(window.document))
     window.history.replaceState({}, 'bar', 'network-breadcrumb-test.html')
@@ -53,29 +51,27 @@ describe('plugin: navigation breadcrumbs', () => {
   })
 
   it('should start a new session if autoTrackSessions=true', (done) => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
+    const { winHandlers, docHandlers, window } = getMockWindow()
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin(window)] })
     c._sessionDelegate = {
       startSession: client => {
         done()
       }
     }
-    const { winHandlers, docHandlers, window } = getMockWindow()
-    c.use(plugin, window)
     winHandlers.load.forEach((h) => h.call(window))
     docHandlers.DOMContentLoaded.forEach((h) => h.call(window.document))
     window.history.replaceState({}, 'bar', 'network-breadcrumb-test.html')
   })
 
   it('should not a new session if autoTrackSessions=false', (done) => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', autoTrackSessions: false })
+    const { winHandlers, docHandlers, window } = getMockWindow()
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', autoTrackSessions: false, plugins: [plugin(window)] })
     c._sessionDelegate = {
       startSession: client => {
         expect('shouldn’t get here').toBe(false)
         done()
       }
     }
-    const { winHandlers, docHandlers, window } = getMockWindow()
-    c.use(plugin, window)
     winHandlers.load.forEach((h) => h.call(window))
     docHandlers.DOMContentLoaded.forEach((h) => h.call(window.document))
     window.history.replaceState({}, 'bar', 'network-breadcrumb-test.html')
@@ -83,14 +79,13 @@ describe('plugin: navigation breadcrumbs', () => {
   })
 
   it('should be enabled when enabledReleaseStages=["navigation"]', () => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledReleaseStages: ['navigation'] })
+    const { winHandlers, docHandlers, window } = getMockWindow()
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledReleaseStages: ['navigation'], plugins: [plugin(window)] })
     c._sessionDelegate = {
       startSession: () => {},
       pauseSession: () => {},
       resumeSession: () => {}
     }
-    const { winHandlers, docHandlers, window } = getMockWindow()
-    c.use(plugin, window)
     winHandlers.load.forEach((h) => h.call(window))
     docHandlers.DOMContentLoaded.forEach((h) => h.call(window.document))
     window.history.replaceState({}, 'bar', 'network-breadcrumb-test.html')
diff --git a/packages/plugin-network-breadcrumbs/network-breadcrumbs.js b/packages/plugin-network-breadcrumbs/network-breadcrumbs.js
index 073ba8a197..444c07ff59 100644
--- a/packages/plugin-network-breadcrumbs/network-breadcrumbs.js
+++ b/packages/plugin-network-breadcrumbs/network-breadcrumbs.js
@@ -7,167 +7,165 @@ const REQUEST_METHOD_KEY = 'BS~~M'
 
 const includes = require('@bugsnag/core/lib/es-utils/includes')
 
-let restoreFunctions = []
-let client
-let win
-let getIgnoredUrls
-
-const defaultIgnoredUrls = () => [
-  client._config.endpoints.notify,
-  client._config.endpoints.sessions
-]
-
 /*
  * Leaves breadcrumbs when network requests occur
  */
-exports.name = 'networkBreadcrumbs'
-exports.init = (_client, _getIgnoredUrls = defaultIgnoredUrls, _win = window) => {
-  if (!_client._config.enabledBreadcrumbTypes || !includes(_client._config.enabledBreadcrumbTypes, 'request')) return
-
-  client = _client
-  win = _win
-  getIgnoredUrls = _getIgnoredUrls
-  monkeyPatchXMLHttpRequest()
-  monkeyPatchFetch()
-}
-
-if (process.env.NODE_ENV !== 'production') {
-  exports.destroy = () => {
-    restoreFunctions.forEach(fn => fn())
-    restoreFunctions = []
-  }
-}
-
-// XMLHttpRequest monkey patch
-const monkeyPatchXMLHttpRequest = () => {
-  if (!('addEventListener' in win.XMLHttpRequest.prototype)) return
-  const nativeOpen = win.XMLHttpRequest.prototype.open
-
-  // override native open()
-  win.XMLHttpRequest.prototype.open = function open (method, url) {
-    // store url and HTTP method for later
-    this[REQUEST_URL_KEY] = url
-    this[REQUEST_METHOD_KEY] = method
-
-    // if we have already setup listeners, it means open() was called twice, we need to remove
-    // the listeners and recreate them
-    if (this[REQUEST_SETUP_KEY]) {
-      this.removeEventListener('load', handleXHRLoad)
-      this.removeEventListener('error', handleXHRError)
-    }
-
-    // attach load event listener
-    this.addEventListener('load', handleXHRLoad)
-    // attach error event listener
-    this.addEventListener('error', handleXHRError)
-
-    this[REQUEST_SETUP_KEY] = true
-
-    nativeOpen.apply(this, arguments)
-  }
-
-  if (process.env.NODE_ENV !== 'production') {
-    restoreFunctions.push(() => {
-      win.XMLHttpRequest.prototype.open = nativeOpen
-    })
-  }
-}
+module.exports = (_ignoredUrls = [], win = window) => {
+  let restoreFunctions = []
+  const plugin = {
+    load: client => {
+      if (!client._config.enabledBreadcrumbTypes || !includes(client._config.enabledBreadcrumbTypes, 'request')) return
+
+      const ignoredUrls = [
+        client._config.endpoints.notify,
+        client._config.endpoints.sessions
+      ].concat(_ignoredUrls)
+
+      monkeyPatchXMLHttpRequest()
+      monkeyPatchFetch()
+
+      // XMLHttpRequest monkey patch
+      function monkeyPatchXMLHttpRequest () {
+        if (!('addEventListener' in win.XMLHttpRequest.prototype)) return
+        const nativeOpen = win.XMLHttpRequest.prototype.open
+
+        // override native open()
+        win.XMLHttpRequest.prototype.open = function open (method, url) {
+          // store url and HTTP method for later
+          this[REQUEST_URL_KEY] = url
+          this[REQUEST_METHOD_KEY] = method
+
+          // if we have already setup listeners, it means open() was called twice, we need to remove
+          // the listeners and recreate them
+          if (this[REQUEST_SETUP_KEY]) {
+            this.removeEventListener('load', handleXHRLoad)
+            this.removeEventListener('error', handleXHRError)
+          }
+
+          // attach load event listener
+          this.addEventListener('load', handleXHRLoad)
+          // attach error event listener
+          this.addEventListener('error', handleXHRError)
+
+          this[REQUEST_SETUP_KEY] = true
+
+          nativeOpen.apply(this, arguments)
+        }
+
+        if (process.env.NODE_ENV !== 'production') {
+          restoreFunctions.push(() => {
+            win.XMLHttpRequest.prototype.open = nativeOpen
+          })
+        }
+      }
 
-function handleXHRLoad () {
-  if (includes(getIgnoredUrls(), this[REQUEST_URL_KEY])) {
-    // don't leave a network breadcrumb from bugsnag notify calls
-    return
-  }
-  const metadata = {
-    status: this.status,
-    request: `${this[REQUEST_METHOD_KEY]} ${this[REQUEST_URL_KEY]}`
-  }
-  if (this.status >= 400) {
-    // contacted server but got an error response
-    client.leaveBreadcrumb('XMLHttpRequest failed', metadata, BREADCRUMB_TYPE)
-  } else {
-    client.leaveBreadcrumb('XMLHttpRequest succeeded', metadata, BREADCRUMB_TYPE)
-  }
-}
+      function handleXHRLoad () {
+        if (includes(ignoredUrls, this[REQUEST_URL_KEY])) {
+          // don't leave a network breadcrumb from bugsnag notify calls
+          return
+        }
+        const metadata = {
+          status: this.status,
+          request: `${this[REQUEST_METHOD_KEY]} ${this[REQUEST_URL_KEY]}`
+        }
+        if (this.status >= 400) {
+          // contacted server but got an error response
+          client.leaveBreadcrumb('XMLHttpRequest failed', metadata, BREADCRUMB_TYPE)
+        } else {
+          client.leaveBreadcrumb('XMLHttpRequest succeeded', metadata, BREADCRUMB_TYPE)
+        }
+      }
 
-function handleXHRError () {
-  if (includes(getIgnoredUrls, this[REQUEST_URL_KEY])) {
-    // don't leave a network breadcrumb from bugsnag notify calls
-    return
-  }
-  // failed to contact server
-  client.leaveBreadcrumb('XMLHttpRequest error', {
-    request: `${this[REQUEST_METHOD_KEY]} ${this[REQUEST_URL_KEY]}`
-  }, BREADCRUMB_TYPE)
-}
+      function handleXHRError () {
+        if (includes(ignoredUrls, this[REQUEST_URL_KEY])) {
+          // don't leave a network breadcrumb from bugsnag notify calls
+          return
+        }
+        // failed to contact server
+        client.leaveBreadcrumb('XMLHttpRequest error', {
+          request: `${this[REQUEST_METHOD_KEY]} ${this[REQUEST_URL_KEY]}`
+        }, BREADCRUMB_TYPE)
+      }
 
-// window.fetch monkey patch
-const monkeyPatchFetch = () => {
-  // only patch it if it exists and if it is not a polyfill (patching a polyfilled
-  // fetch() results in duplicate breadcrumbs for the same request because the
-  // implementation uses XMLHttpRequest which is also patched)
-  if (!('fetch' in win) || win.fetch.polyfill) return
-
-  const oldFetch = win.fetch
-  win.fetch = function fetch () {
-    const urlOrRequest = arguments[0]
-    const options = arguments[1]
-
-    let method
-    let url = null
-
-    if (urlOrRequest && typeof urlOrRequest === 'object') {
-      url = urlOrRequest.url
-      if (options && 'method' in options) {
-        method = options.method
-      } else if (urlOrRequest && 'method' in urlOrRequest) {
-        method = urlOrRequest.method
+      // window.fetch monkey patch
+      function monkeyPatchFetch () {
+        // only patch it if it exists and if it is not a polyfill (patching a polyfilled
+        // fetch() results in duplicate breadcrumbs for the same request because the
+        // implementation uses XMLHttpRequest which is also patched)
+        if (!('fetch' in win) || win.fetch.polyfill) return
+
+        const oldFetch = win.fetch
+        win.fetch = function fetch () {
+          const urlOrRequest = arguments[0]
+          const options = arguments[1]
+
+          let method
+          let url = null
+
+          if (urlOrRequest && typeof urlOrRequest === 'object') {
+            url = urlOrRequest.url
+            if (options && 'method' in options) {
+              method = options.method
+            } else if (urlOrRequest && 'method' in urlOrRequest) {
+              method = urlOrRequest.method
+            }
+          } else {
+            url = urlOrRequest
+            if (options && 'method' in options) {
+              method = options.method
+            }
+          }
+
+          if (method === undefined) {
+            method = 'GET'
+          }
+
+          return new Promise((resolve, reject) => {
+            // pass through to native fetch
+            oldFetch(...arguments)
+              .then(response => {
+                handleFetchSuccess(response, method, url)
+                resolve(response)
+              })
+              .catch(error => {
+                handleFetchError(method, url)
+                reject(error)
+              })
+          })
+        }
+
+        if (process.env.NODE_ENV !== 'production') {
+          restoreFunctions.push(() => {
+            win.fetch = oldFetch
+          })
+        }
       }
-    } else {
-      url = urlOrRequest
-      if (options && 'method' in options) {
-        method = options.method
+
+      const handleFetchSuccess = (response, method, url) => {
+        const metadata = {
+          status: response.status,
+          request: `${method} ${url}`
+        }
+        if (response.status >= 400) {
+          // when the request comes back with a 4xx or 5xx status it does not reject the fetch promise,
+          client.leaveBreadcrumb('fetch() failed', metadata, BREADCRUMB_TYPE)
+        } else {
+          client.leaveBreadcrumb('fetch() succeeded', metadata, BREADCRUMB_TYPE)
+        }
       }
-    }
 
-    if (method === undefined) {
-      method = 'GET'
+      const handleFetchError = (method, url) => {
+        client.leaveBreadcrumb('fetch() error', { request: `${method} ${url}` }, BREADCRUMB_TYPE)
+      }
     }
-
-    return new Promise((resolve, reject) => {
-      // pass through to native fetch
-      oldFetch(...arguments)
-        .then(response => {
-          handleFetchSuccess(response, method, url)
-          resolve(response)
-        })
-        .catch(error => {
-          handleFetchError(method, url)
-          reject(error)
-        })
-    })
   }
 
   if (process.env.NODE_ENV !== 'production') {
-    restoreFunctions.push(() => {
-      win.fetch = oldFetch
-    })
-  }
-}
-
-const handleFetchSuccess = (response, method, url) => {
-  const metadata = {
-    status: response.status,
-    request: `${method} ${url}`
-  }
-  if (response.status >= 400) {
-    // when the request comes back with a 4xx or 5xx status it does not reject the fetch promise,
-    client.leaveBreadcrumb('fetch() failed', metadata, BREADCRUMB_TYPE)
-  } else {
-    client.leaveBreadcrumb('fetch() succeeded', metadata, BREADCRUMB_TYPE)
+    plugin.destroy = () => {
+      restoreFunctions.forEach(fn => fn())
+      restoreFunctions = []
+    }
   }
-}
 
-const handleFetchError = (method, url) => {
-  client.leaveBreadcrumb('fetch() error', { request: `${method} ${url}` }, BREADCRUMB_TYPE)
+  return plugin
 }
diff --git a/packages/plugin-network-breadcrumbs/test/network-breadcrumbs.test.js b/packages/plugin-network-breadcrumbs/test/network-breadcrumbs.test.js
index a08c20dd6f..d2d461d1f4 100644
--- a/packages/plugin-network-breadcrumbs/test/network-breadcrumbs.test.js
+++ b/packages/plugin-network-breadcrumbs/test/network-breadcrumbs.test.js
@@ -1,6 +1,7 @@
 const { describe, it, expect, jasmine, afterEach } = global
 
 const plugin = require('../')
+let p
 
 const Client = require('@bugsnag/core/client')
 
@@ -46,14 +47,14 @@ function Request (url, opts) {
 describe('plugin: network breadcrumbs', () => {
   afterEach(() => {
     // undo the global side effects
-    plugin.destroy()
+    if (p) p.destroy()
   })
 
   it('should leave a breadcrumb when an XMLHTTPRequest resolves', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', '/')
@@ -74,8 +75,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should not leave duplicate breadcrumbs if open() is called twice', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, undefined, window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', '/')
@@ -87,8 +88,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should leave a breadcrumb when an XMLHTTPRequest has a failed response', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', '/this-does-not-exist')
@@ -108,8 +109,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should leave a breadcrumb when an XMLHTTPRequest has a network error', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new window.XMLHttpRequest()
 
@@ -129,8 +130,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should not leave a breadcrumb for request to bugsnag notify endpoint', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, undefined, window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', client._config.endpoints.notify)
@@ -142,8 +143,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should not leave a breadcrumb for session tracking requests', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, undefined, window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', client._config.endpoints.sessions)
@@ -154,8 +155,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should leave a breadcrumb when a fetch() resolves', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch('/', {}, false, 200).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -174,8 +175,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle a fetch(url, { method: null })', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch('/', { method: null }, false, 405).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -194,8 +195,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle a fetch() request supplied with a Request object', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new Request('/')
 
@@ -216,8 +217,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle a fetch() request supplied with a Request object that has a method specified', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     const request = new Request('/', { method: 'PUT' })
 
@@ -238,8 +239,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle fetch(null)', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch(null, {}, false, 404).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -258,8 +259,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle fetch(url, null)', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch('/', null, false, 200).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -278,8 +279,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle fetch(undefined)', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch(undefined, {}, false, 404).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -298,8 +299,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle a fetch(request, { method })', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch(new Request('/foo', { method: 'GET' }), { method: 'PUT' }, false, 200).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -318,8 +319,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle a fetch(request, { method: null })', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch(new Request('/foo'), { method: null }, false, 405).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -338,8 +339,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should handle a fetch(request, { method: undefined })', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch(new Request('/foo'), { method: undefined }, false, 200).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -358,8 +359,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should leave a breadcrumb when a fetch() has a failed response', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch('/does-not-exist', {}, false, 404).then(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -378,8 +379,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should leave a breadcrumb when a fetch() has a network error', (done) => {
     const window = { XMLHttpRequest, fetch }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [p] })
 
     window.fetch('https://another-domain.xyz/foo/bar', {}, true).catch(() => {
       expect(client._breadcrumbs.length).toBe(1)
@@ -397,8 +398,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should not be enabled when enabledBreadcrumbTypes=[]', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', '/')
@@ -410,8 +411,8 @@ describe('plugin: network breadcrumbs', () => {
   it('should be enabled when enabledBreadcrumbTypes=["request"]', () => {
     const window = { XMLHttpRequest }
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['request'] })
-    client.use(plugin, () => [], window)
+    p = plugin([], window)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['request'], plugins: [p] })
 
     const request = new window.XMLHttpRequest()
     request.open('GET', '/')
diff --git a/packages/plugin-node-device/device.js b/packages/plugin-node-device/device.js
index fa0e4ae2b5..2eeec4d464 100644
--- a/packages/plugin-node-device/device.js
+++ b/packages/plugin-node-device/device.js
@@ -2,7 +2,7 @@
  * Automatically detects browser device details
  */
 module.exports = {
-  init: (client) => {
+  load: (client) => {
     const device = {
       hostname: client._config.hostname,
       runtimeVersions: { node: process.versions.node }
diff --git a/packages/plugin-node-device/test/device.test.js b/packages/plugin-node-device/test/device.test.js
index 5b2f3e620c..48aae7896d 100644
--- a/packages/plugin-node-device/test/device.test.js
+++ b/packages/plugin-node-device/test/device.test.js
@@ -14,8 +14,7 @@ const schema = {
 
 describe('plugin: node device', () => {
   it('should set device = { hostname, runtimeVersions } add an onError callback which adds device time', done => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' }, schema)
-    client.use(plugin)
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin] }, schema)
 
     expect(client._cbs.sp.length).toBe(1)
     expect(client._cbs.e.length).toBe(1)
diff --git a/packages/plugin-node-in-project/in-project.js b/packages/plugin-node-in-project/in-project.js
index 0c4aa32823..d9012bde7a 100644
--- a/packages/plugin-node-in-project/in-project.js
+++ b/packages/plugin-node-in-project/in-project.js
@@ -1,7 +1,7 @@
 const normalizePath = require('@bugsnag/core/lib/path-normalizer')
 
 module.exports = {
-  init: client => client.addOnError(event => {
+  load: client => client.addOnError(event => {
     if (!client._config.projectRoot) return
     const projectRoot = normalizePath(client._config.projectRoot)
     const allFrames = event.errors.reduce((accum, er) => accum.concat(er.stacktrace), [])
diff --git a/packages/plugin-node-in-project/test/in-project.test.js b/packages/plugin-node-in-project/test/in-project.test.js
index 8f7f154acd..dd19e0a2f6 100644
--- a/packages/plugin-node-in-project/test/in-project.test.js
+++ b/packages/plugin-node-in-project/test/in-project.test.js
@@ -8,7 +8,7 @@ const { schema } = require('@bugsnag/core/config')
 
 describe('plugin: node in project', () => {
   it('should mark stackframes as "inProject" if it is a descendent of the "projectRoot"', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -28,8 +28,6 @@ describe('plugin: node in project', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'in project test', [
       {
         lineNumber: 22,
@@ -48,7 +46,7 @@ describe('plugin: node in project', () => {
   })
 
   it('should mark stackframes as "out of project" if it is not a descendent of "projectRoot"', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -68,8 +66,6 @@ describe('plugin: node in project', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'in project test', [
       {
         lineNumber: 22,
@@ -88,7 +84,7 @@ describe('plugin: node in project', () => {
   })
 
   it('should work with node_modules and node internals', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -107,8 +103,6 @@ describe('plugin: node in project', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'in project test', [
       {
         lineNumber: 22,
@@ -123,7 +117,7 @@ describe('plugin: node in project', () => {
   })
 
   it('should tolerate stackframe.file not being a string', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -143,8 +137,6 @@ describe('plugin: node in project', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'in project test', [
       {
         lineNumber: 22,
diff --git a/packages/plugin-node-surrounding-code/surrounding-code.js b/packages/plugin-node-surrounding-code/surrounding-code.js
index 56d473b124..d3cceb7d2c 100644
--- a/packages/plugin-node-surrounding-code/surrounding-code.js
+++ b/packages/plugin-node-surrounding-code/surrounding-code.js
@@ -7,7 +7,7 @@ const pump = require('pump')
 const byline = require('byline')
 
 module.exports = {
-  init: client => {
+  load: client => {
     if (!client._config.sendCode) return
 
     const loadSurroundingCode = (stackframe, cache) => new Promise((resolve, reject) => {
diff --git a/packages/plugin-node-surrounding-code/test/fixtures/04.js b/packages/plugin-node-surrounding-code/test/fixtures/04.js
index cf64fc532b..941cea7301 100644
--- a/packages/plugin-node-surrounding-code/test/fixtures/04.js
+++ b/packages/plugin-node-surrounding-code/test/fixtures/04.js
@@ -1,2 +1,2 @@
-!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).bugsnag=e()}}(function(){var t=function(e,t,n){for(var r=n,i=0,o=e.length;i<o;i++)r=t(r,e[i],i,e);return r},o=!{toString:null}.propertyIsEnumerable("toString"),a=["toString","toLocaleString","valueOf","hasOwnProperty","isPrototypeOf","propertyIsEnumerable","constructor"],n=function(e){return e<10?"0"+e:e},e=function(e,i){return t(e,function(e,t,n,r){return e.concat(i(t,n,r))},[])},r=t,i=function(e,i){return t(e,function(e,t,n,r){return i(t,n,r)?e.concat(t):e},[])},s=function(e,i){return t(e,function(e,t,n,r){return!0===e||t===i},!1)},u=function(e){return"[object Array]"===Object.prototype.toString.call(e)},c=function(){var e=new Date;return e.getUTCFullYear()+"-"+n(e.getUTCMonth()+1)+"-"+n(e.getUTCDate())+"T"+n(e.getUTCHours())+":"+n(e.getUTCMinutes())+":"+n(e.getUTCSeconds())+"."+(e.getUTCMilliseconds()/1e3).toFixed(3).slice(2,5)+"Z"},f={intRange:function(t,n){return void 0===t&&(t=1),void 0===n&&(n=Infinity),function(e){return"number"==typeof e&&parseInt(""+e,10)===e&&t<=e&&e<=n}},stringWithLength:function(e){return"string"==typeof e&&!!e.length}},l={},d=i,g=r,p=function(e){var t,n=[];for(t in e)Object.prototype.hasOwnProperty.call(e,t)&&n.push(t);if(!o)return n;for(var r=0,i=a.length;r<i;r++)Object.prototype.hasOwnProperty.call(e,a[r])&&n.push(a[r]);return n},h=u,v=s,m=f.intRange,y=f.stringWithLength;function b(){return(b=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e}).apply(this,arguments)}l.schema={apiKey:{defaultValue:function(){return null},message:"is 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e&&y(e.notify)&&(!1===t.autoCaptureSessions||y(e.sessions))&&0===d(p(e),function(e){return!v(["notify","sessions"],e)}).length}},autoCaptureSessions:{defaultValue:function(e,t){return t.endpoints===undefined||!!t.endpoints&&!!t.endpoints.sessions},message:"should be true|false",validate:function(e){return!0===e||!1===e}},notifyReleaseStages:{defaultValue:function(){return null},message:"should be an array of strings",validate:function(e){return null===e||h(e)&&d(e,function(e){return"string"==typeof e}).length===e.length}},releaseStage:{defaultValue:function(){return"production"},message:"should be a string",validate:function(e){return"string"==typeof e&&e.length}},maxBreadcrumbs:{defaultValue:function(){return 20},message:"should be a number ≤40",validate:function(e){return m(0,40)(e)}},autoBreadcrumbs:{defaultValue:function(){return!0},message:"should be true|false",validate:function(e){return"boolean"==typeof e}},user:{defaultValue:function(){return null},message:"(object) user 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l=et(["setTimeout","setInterval","setImmediate","requestAnimationFrame"],function(e){return it(t,e,function(e){return d(e,function(t){return{get:function(){return t[0]},replace:function(e){t[0]=e}}})})})[0];function d(o,a){return function(){var e=Array.prototype.slice.call(arguments),t=a(e),n=t.get();if("function"!=typeof n)return o.apply(this,e);try{if(n.__trace__)t.replace(n.__trace__);else{var r=f();n.__trace__=function(){c(r),l(function(){c(null)},0),n.apply(this,arguments)},n.__trace__.__trace__=n.__trace__,t.replace(n.__trace__)}}catch(i){}if(o.apply)return o.apply(this,e);switch(e.length){case 1:return o(e[0]);case 2:return o(e[0],e[1]);default:return o()}}}et(["EventTarget","Window","Node","ApplicationCache","AudioTrackList","ChannelMergerNode","CryptoOperation","EventSource","FileReader","HTMLUnknownElement","IDBDatabase","IDBRequest","IDBTransaction","KeyOperation","MediaController","MessagePort","ModalWindow","Notification","SVGElementInstance","Screen","TextTrack","TextTrackCue","TextTrackList","WebSocket","WebSocketWorker","Worker","XMLHttpRequest","XMLHttpRequestEventTarget","XMLHttpRequestUpload"],function(e){t[e]&&t[e].prototype&&"function"==typeof t[e].prototype.addEventListener&&(it(t[e].prototype,"addEventListener",function(e){return d(e,ot)}),it(t[e].prototype,"removeEventListener",function(e){return d(e,ot)}))})}};function it(e,t,n){var r=e[t];if(!r)return r;var i=n(r);return e[t]=i,r}function ot(t){var n=!!t[1]&&"function"==typeof t[1].handleEvent;return{get:function(){return n?t[1].handleEvent:t[1]},replace:function(e){n?t[1].handleEvent=e:t[1]=e}}}var at={loadfunction(i,a){if(void 0===a&&(a=window),"addEventListener"in a){var e=!1===i.config.interactionBreadcrumbsEnabled,t=!1===i.config.autoBreadcrumbs&&!0!==i.config.interactionBreadcrumbsEnabled;e||t||a.addEventListener("click",function(e){var t,n;try{t=st(e.target),n=function o(e,t){var n=[e.tagName];e.id&&n.push("#"+e.id);e.className&&e.className.length&&n.push("."+e.className.split(" ").join("."));if(!t.document.querySelectorAll||!Array.prototype.indexOf)return n.join("");try{if(1===t.document.querySelectorAll(n.join("")).length)return n.join("")}catch(i){return n.join("")}if(1<e.parentNode.childNodes.length){var r=Array.prototype.indexOf.call(e.parentNode.childNodes,e)+1;n.push(":nth-child("+r+")")}if(1===t.document.querySelectorAll(n.join("")).length)return n.join("");if(e.parentNode)return o(e.parentNode,t)+" > "+n.join("");return n.join("")}(e.target,a)}catch(r){n=t="[hidden]",i._logger.error("Cross domain error when tracking click event. See docs: https://tinyurl.com/y94fq5zm")}i.leaveBreadcrumb("UI click",{targetText:t,targetSelector:n},"user")},!0)}},configSchema:{interactionBreadcrumbsEnabled:{defaultValue:function(){return undefined},validate:function(e){return!0===e||!1===e||e===undefined},message:"should be true|false"}}},st=function(e){var t=e.textContent||e.innerText||"";return t||"submit"!==e.type&&"button"!==e.type||(t=e.value),function n(e,t){return e&&e.length<=t?e:e.slice(0,t-"(...)".length)+"(...)"}(t=t.replace(/^\s+|\s+$/g,""),140)};var ut={loadfunction(n,r){if(void 0===r&&(r=window),"addEventListener"in r){var e=!1===n.config.navigationBreadcrumbsEnabled,t=!1===n.config.autoBreadcrumbs&&!0!==n.config.navigationBreadcrumbsEnabled;if(!e&&!t){var i=function(e){return function(){return n.leaveBreadcrumb(e,{},"navigation")}};r.addEventListener("pagehide",i("Page hidden"),!0),r.addEventListener("pageshow",i("Page shown"),!0),r.addEventListener("load",i("Page loaded"),!0),r.document.addEventListener("DOMContentLoaded",i("DOMContentLoaded"),!0),r.addEventListener("load",function(){return r.addEventListener("popstate",i("Navigated back"),!0)}),r.addEventListener("hashchange",function(e){var t=e.oldURL?{from:dt(e.oldURL,r),to:dt(e.newURL,r),state:pt(r)}:{to:dt(r.location.href,r)};n.leaveBreadcrumb("Hash changed",t,"navigation")},!0),r.history.replaceState&&gt(n,r.history,"replaceState",r),r.history.pushState&&gt(n,r.history,"pushState",r),n.leaveBreadcrumb("Bugsnag loaded",{},"navigation")}}}};ut.configSchema={navigationBreadcrumbsEnabled:{defaultValue:function(){return undefined},validate:function(e){return!0===e||!1===e||e===undefined},message:"should be true|false"}};var ct,ft,lt,dt=function(e,t){var n=t.document.createElement("A");return n.href=e,""+n.pathname+n.search+n.hash},gt=function(u,c,f,l){var d=c[f];c[f]=function(e,t,n){var r,i,o,a,s;u.leaveBreadcrumb("History "+f,(i=e,o=t,a=n,s=dt((r=l).location.href,r),{title:o,state:i,prevState:pt(r),to:a||s,from:s}),"navigation"),"function"==typeof u.refresh&&u.refresh(),u.config.autoCaptureSessions&&u.startSession(),d.apply(c,[e,t].concat(n!==undefined?n:[]))},c[f]._restore=function(){c[f]=d}},pt=function(e){try{return e.history.state}catch(t){}},ht={},vt="request",mt="BS~~U",yt="BS~~M",bt=s,wt=function(){return[ct.config.endpoints.notify,ct.config.endpoints.sessions]};ht.name="networkBreadcrumbs",ht.init=function(e,t,n){void 0===t&&(t=wt),void 0===n&&(n=window);var r=!1===e.config.networkBreadcrumbsEnabled,i=!1===e.config.autoBreadcrumbs&&!0!==e.config.networkBreadcrumbsEnabled;r||i||(ct=e,ft=n,lt=t,St(),Et())},ht.configSchema={networkBreadcrumbsEnabled:{defaultValue:function(){return undefined},validate:function(e){return!0===e||!1===e||e===undefined},message:"should be true|false"}};var St=function(){if("addEventListener"in ft.XMLHttpRequest.prototype){var n=ft.XMLHttpRequest.prototype.open;ft.XMLHttpRequest.prototype.open=function(e,t){this[mt]=t,this[yt]=e,this["BS~~S"]&&(this.removeEventListener("load",Ot),this.removeEventListener("error",_t)),this.addEventListener("load",Ot),this.addEventListener("error",_t),this["BS~~S"]=!0,n.apply(this,arguments)}}};function Ot(){if(!bt(lt(),this[mt])){var e={status:this.status,request:this[yt]+" "+this[mt]};400<=this.status?ct.leaveBreadcrumb("XMLHttpRequest failed",e,vt):ct.leaveBreadcrumb("XMLHttpRequest succeeded",e,vt)}}function _t(){bt(lt,this[mt])||ct.leaveBreadcrumb("XMLHttpRequest error",{request:this[yt]+" "+this[mt]},vt)}var Et=function(){if("fetch"in ft&&!ft.fetch.polyfill){var a=ft.fetch;ft.fetch=function(){for(var e=arguments.length,r=new Array(e),t=0;t<e;t++)r[t]=arguments[t];var i=r[0],n=r[1],o="GET";return n&&n.method&&(o=n.method),new Promise(function(t,n){a.apply(void 0,r).then(function(e){jt(e,o,i),t(e)})["catch"](function(e){Nt(o,i),n(e)})})}}},jt=function(e,t,n){var r={status:e.status,request:t+" "+n};400<=e.status?ct.leaveBreadcrumb("fetch() failed",r,vt):ct.leaveBreadcrumb("fetch() succeeded",r,vt)},Nt=function(e,t){ct.leaveBreadcrumb("fetch() error",{request:e+" "+t},vt)},kt=f.intRange,Bt={loadfunction(t){var n=0;t.config.onError.push(function(e){if(n>=t.config.maxEvents)return e.ignore();n++}),t.refresh=function(){n=0}},configSchema:{maxEvents:{defaultValue:function(){return 10},message:"should be a positive integer ≤100",validate:function(e){return kt(1,100)(e)}}}},Rt={};function Lt(){return(Lt=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e}).apply(this,arguments)}var Dt=e,xt=(Rt={loadfunction(e){e.config.onError.push(function(e){e.stacktrace=Dt(e.stacktrace,function(e){return Lt({},e,{file:xt(e.file)})})})}})._strip=function(e){return"string"==typeof e?e.replace(/\?.*$/,"").replace(/#.*$/,""):e},qt={loadfunction(c,e){void 0===e&&(e=window);var f=e.onerror;e.onerror=function l(e,t,n,r,i){if(0===n&&/Script error\.?/.test(e))c._logger.warn("Ignoring cross-domain or eval script error. See docs: https://tinyurl.com/y94fq5zm");else{var o,a={severity:"error",unhandled:!0,severityReason:{type:"unhandledException"}};if(i)i.name&&i.message?o=new c.BugsnagReport(i.name,i.message,Tt(c.BugsnagReport.getStacktrace(i),t,n,r),a,i):(o=new c.BugsnagReport("window.onerror",String(i),Tt(c.BugsnagReport.getStacktrace(i,1),t,n,r),a,i)).addMetadata("window onerror",{error:i});else if("object"!=typeof e||null===e||t&&"string"==typeof t||n||r||i)(o=new c.BugsnagReport("window.onerror",String(e),Tt(c.BugsnagReport.getStacktrace(i,1),t,n,r),a,e)).addMetadata("window onerror",{event:e});else{var s=e.type?"Event: "+e.type:"window.onerror",u=e.message||e.detail||"";(o=new c.BugsnagReport(s,u,c.BugsnagReport.getStacktrace(new Error,1).slice(1),a,e)).addMetadata("window onerror",{event:e,extraParameters:t})}c.notify(o)}"function"==typeof f&&f.apply(this,arguments)}}},Tt=function(e,t,n,r){var i=e[0];return i&&(i.fileName||"string"!=typeof t||i.setFileName(t),!i.lineNumber&&Ct(n)&&i.setLineNumber(n),i.columnNumber||(Ct(r)?i.setColumnNumber(r):window.event&&Ct(window.event.errorCharacter)&&i.setColumnNumber(window.event.errorCharacter))),e},Ct=function(e){return"number"==typeof e&&"NaN"!==String.call(e)},Mt={},Pt=r;Mt.init=function(a,e){void 0===e&&(e=window);var n=function(e){var t=e.reason,n=!1;try{e.detail&&e.detail.reason&&(t=e.detail.reason,n=!0)}catch(o){}var r,i={severity:"error",unhandled:!0,severityReason:{type:"unhandledPromiseRejection"}};if(t&&x(t))r=new a.BugsnagReport(t.name,t.message,D.parse(t),i,t),n&&(r.stacktrace=Pt(r.stacktrace,Ht(t),[]));else{(r=new a.BugsnagReport(t&&t.name?t.name:"UnhandledRejection",t&&t.message?t.message:'Rejection reason was not an Error. 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No sessions will be sent.");var n=new he({name:"Bugsnag JavaScript",version:"6.2.0",url:"https://github.com/bugsnag/bugsnag-js"});return n.setOptions(e),n.delivery(window.XDomainRequest?Re:Ce),n.configure(Ut),t&&n._logger.warn(t),n.use(Ve),n.use(Me),n.use(Ie),n.use(rt),n.use(Bt),n.use(Ke),n.use(We),n.use(Rt),!1!==n.config.autoNotify&&(n.use(qt),n.use(Mt)),n.use(ut),n.use(at),n.use(ht),n.use(ze),n._logger.debug("Loaded!"),n.config.autoCaptureSessions?n.startSession():n}).Bugsnag={Client:he,Report:U,Session:ie,Breadcrumb:j},At["default"]=At});
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diff --git a/packages/plugin-node-surrounding-code/test/surrounding-code.test.js b/packages/plugin-node-surrounding-code/test/surrounding-code.test.js
index b0994bb7f1..8aaa33d785 100644
--- a/packages/plugin-node-surrounding-code/test/surrounding-code.test.js
+++ b/packages/plugin-node-surrounding-code/test/surrounding-code.test.js
@@ -15,7 +15,7 @@ const Client = require('@bugsnag/core/client')
 
 describe('plugin: node surrounding code', () => {
   it('should load code successfully for stackframes whose files exist', done => {
-    const client = new Client({ apiKey: 'api_key' })
+    const client = new Client({ apiKey: 'api_key' }, undefined, [plugin])
 
     client._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -40,8 +40,6 @@ describe('plugin: node surrounding code', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'surrounding code loading test', [
       {
         lineNumber: 22,
@@ -60,7 +58,7 @@ describe('plugin: node surrounding code', () => {
   })
 
   it('should tolerate missing files for some stackframes', done => {
-    const client = new Client({ apiKey: 'api_key' })
+    const client = new Client({ apiKey: 'api_key' }, undefined, [plugin])
 
     client._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -73,8 +71,6 @@ describe('plugin: node surrounding code', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'surrounding code loading test', [
       {
         lineNumber: 22,
@@ -93,7 +89,7 @@ describe('plugin: node surrounding code', () => {
   })
 
   it('behaves sensibly for code at the beginning and end of a file', done => {
-    const client = new Client({ apiKey: 'api_key' })
+    const client = new Client({ apiKey: 'api_key' }, undefined, [plugin])
 
     client._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -115,8 +111,6 @@ describe('plugin: node surrounding code', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'surrounding code loading test', [
       {
         lineNumber: 1,
@@ -132,7 +126,7 @@ describe('plugin: node surrounding code', () => {
   })
 
   it('only loads code once for the same file/line/column', done => {
-    const client = new Client({ apiKey: 'api_key' })
+    const client = new Client({ apiKey: 'api_key' }, undefined, [plugin])
 
     const startCount = createReadStreamCount
 
@@ -153,8 +147,6 @@ describe('plugin: node surrounding code', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'surrounding code loading test', [
       {
         lineNumber: 1,
@@ -200,7 +192,7 @@ describe('plugin: node surrounding code', () => {
   })
 
   it('truncates lines to a sensible number of characters', done => {
-    const client = new Client({ apiKey: 'api_key' })
+    const client = new Client({ apiKey: 'api_key' }, undefined, [plugin])
 
     client._setDelivery(client => ({
       sendEvent: (payload) => {
@@ -214,8 +206,6 @@ describe('plugin: node surrounding code', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'surrounding code loading test', [
       {
         lineNumber: 1,
diff --git a/packages/plugin-node-uncaught-exception/test/uncaught-exception.test.js b/packages/plugin-node-uncaught-exception/test/uncaught-exception.test.js
index 9bde3ddf29..facc28cbdf 100644
--- a/packages/plugin-node-uncaught-exception/test/uncaught-exception.test.js
+++ b/packages/plugin-node-uncaught-exception/test/uncaught-exception.test.js
@@ -7,30 +7,31 @@ const plugin = require('../')
 describe('plugin: node uncaught exception handler', () => {
   it('should listen to the process#uncaughtException event', () => {
     const before = process.listeners('uncaughtException').length
-    const c = new Client({ apiKey: 'api_key' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const after = process.listeners('uncaughtException').length
     expect(after - before).toBe(1)
+    expect(c).toBe(c)
     plugin.destroy()
   })
 
   it('does not add a process#uncaughtException listener when autoDetectErrors=false', () => {
     const before = process.listeners('uncaughtException').length
-    const c = new Client({ apiKey: 'api_key', autoDetectErrors: false })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'api_key', autoDetectErrors: false, plugins: [plugin] })
     const after = process.listeners('uncaughtException').length
     expect(after).toBe(before)
+    expect(c).toBe(c)
   })
 
   it('does not add a process#uncaughtException listener when enabledErrorTypes.unhandledExceptions=false', () => {
     const before = process.listeners('uncaughtException').length
     const c = new Client({
       apiKey: 'api_key',
-      enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: true }
+      enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: true },
+      plugins: [plugin]
     })
-    c.use(plugin)
     const after = process.listeners('uncaughtException').length
     expect(after).toBe(before)
+    expect(c).toBe(c)
   })
 
   it('should call the configured onUncaughtException callback', done => {
@@ -44,7 +45,8 @@ describe('plugin: node uncaught exception handler', () => {
         expect(event._handledState.severityReason).toEqual({ type: 'unhandledException' })
         plugin.destroy()
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUncaughtException: {
@@ -57,7 +59,6 @@ describe('plugin: node uncaught exception handler', () => {
       sendEvent: (...args) => args[args.length - 1](),
       sendSession: (...args) => args[args.length - 1]()
     }))
-    c.use(plugin)
     process.listeners('uncaughtException')[1](new Error('never gonna catch me'))
   })
 
@@ -72,7 +73,8 @@ describe('plugin: node uncaught exception handler', () => {
         expect(event._handledState.severityReason).toEqual({ type: 'unhandledException' })
         plugin.destroy()
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUncaughtException: {
@@ -85,7 +87,6 @@ describe('plugin: node uncaught exception handler', () => {
       sendEvent: (...args) => args[args.length - 1](new Error('failed')),
       sendSession: (...args) => args[args.length - 1]()
     }))
-    c.use(plugin)
     process.listeners('uncaughtException')[1](new Error('never gonna catch me'))
   })
 })
diff --git a/packages/plugin-node-uncaught-exception/uncaught-exception.js b/packages/plugin-node-uncaught-exception/uncaught-exception.js
index 43b44633c2..cf703a34bf 100644
--- a/packages/plugin-node-uncaught-exception/uncaught-exception.js
+++ b/packages/plugin-node-uncaught-exception/uncaught-exception.js
@@ -1,6 +1,6 @@
 let _handler
 module.exports = {
-  init: client => {
+  load: client => {
     if (!client._config.autoDetectErrors) return
     if (!client._config.enabledErrorTypes.unhandledExceptions) return
     _handler = err => {
diff --git a/packages/plugin-node-unhandled-rejection/test/unhandled-rejection.test.js b/packages/plugin-node-unhandled-rejection/test/unhandled-rejection.test.js
index 87d39cc9c4..bfc409e7fd 100644
--- a/packages/plugin-node-unhandled-rejection/test/unhandled-rejection.test.js
+++ b/packages/plugin-node-unhandled-rejection/test/unhandled-rejection.test.js
@@ -7,18 +7,18 @@ const plugin = require('../')
 describe('plugin: node unhandled rejection handler', () => {
   it('should listen to the process#unhandledRejection event', () => {
     const before = process.listeners('unhandledRejection').length
-    const c = new Client({ apiKey: 'api_key' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const after = process.listeners('unhandledRejection').length
     expect(before < after).toBe(true)
+    expect(c).toBe(c)
     plugin.destroy()
   })
 
   it('does not add a process#unhandledRejection listener if autoDetectErrors=false', () => {
     const before = process.listeners('unhandledRejection').length
-    const c = new Client({ apiKey: 'api_key', autoDetectErrors: false })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'api_key', autoDetectErrors: false, plugins: [plugin] })
     const after = process.listeners('unhandledRejection').length
+    expect(c).toBe(c)
     expect(after).toBe(before)
   })
 
@@ -26,10 +26,11 @@ describe('plugin: node unhandled rejection handler', () => {
     const before = process.listeners('unhandledRejection').length
     const c = new Client({
       apiKey: 'api_key',
-      enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: false }
+      enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: false },
+      plugins: [plugin]
     })
-    c.use(plugin)
     const after = process.listeners('unhandledRejection').length
+    expect(c).toBe(c)
     expect(after).toBe(before)
   })
 
@@ -44,7 +45,8 @@ describe('plugin: node unhandled rejection handler', () => {
         expect(event._handledState.severityReason).toEqual({ type: 'unhandledPromiseRejection' })
         plugin.destroy()
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUnhandledRejection: {
@@ -57,7 +59,6 @@ describe('plugin: node unhandled rejection handler', () => {
       sendEvent: (...args) => args[args.length - 1](),
       sendSession: (...args) => args[args.length - 1]()
     }))
-    c.use(plugin)
     process.listeners('unhandledRejection')[1](new Error('never gonna catch me'))
   })
 
@@ -72,7 +73,8 @@ describe('plugin: node unhandled rejection handler', () => {
         expect(event._handledState.severityReason).toEqual({ type: 'unhandledPromiseRejection' })
         plugin.destroy()
         done()
-      }
+      },
+      plugins: [plugin]
     }, {
       ...schema,
       onUnhandledRejection: {
@@ -85,7 +87,6 @@ describe('plugin: node unhandled rejection handler', () => {
       sendEvent: (...args) => args[args.length - 1](new Error('floop')),
       sendSession: (...args) => args[args.length - 1]()
     }))
-    c.use(plugin)
     process.listeners('unhandledRejection')[1](new Error('never gonna catch me'))
   })
 })
diff --git a/packages/plugin-node-unhandled-rejection/unhandled-rejection.js b/packages/plugin-node-unhandled-rejection/unhandled-rejection.js
index 927965c192..d67aa837ad 100644
--- a/packages/plugin-node-unhandled-rejection/unhandled-rejection.js
+++ b/packages/plugin-node-unhandled-rejection/unhandled-rejection.js
@@ -1,6 +1,6 @@
 let _handler
 module.exports = {
-  init: client => {
+  load: client => {
     if (!client._config.autoDetectErrors || !client._config.enabledErrorTypes.unhandledRejections) return
     _handler = err => {
       const event = client.Event.create(err, false, {
diff --git a/packages/plugin-react-native-app-state-breadcrumbs/app-state.js b/packages/plugin-react-native-app-state-breadcrumbs/app-state.js
index d657391e33..bbdae9ded3 100644
--- a/packages/plugin-react-native-app-state-breadcrumbs/app-state.js
+++ b/packages/plugin-react-native-app-state-breadcrumbs/app-state.js
@@ -1,7 +1,7 @@
 const { AppState } = require('react-native')
 
 module.exports = {
-  init: client => {
+  load: client => {
     if (!client._config.enabledBreadcrumbTypes || !client._config.enabledBreadcrumbTypes.includes('state')) return
 
     AppState.addEventListener('change', state => {
diff --git a/packages/plugin-react-native-app-state-breadcrumbs/test/app-state.test.js b/packages/plugin-react-native-app-state-breadcrumbs/test/app-state.test.js
index 271123b86a..fd9d3d5179 100644
--- a/packages/plugin-react-native-app-state-breadcrumbs/test/app-state.test.js
+++ b/packages/plugin-react-native-app-state-breadcrumbs/test/app-state.test.js
@@ -16,8 +16,8 @@ describe('plugin: react native app state breadcrumbs', () => {
       'react-native': { AppState }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(typeof _cb).toBe('function')
     expect(client._breadcrumbs.length).toBe(0)
@@ -46,8 +46,8 @@ describe('plugin: react native app state breadcrumbs', () => {
       'react-native': { AppState }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: null })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: null, plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(_cb).toBe(undefined)
   })
@@ -63,8 +63,8 @@ describe('plugin: react native app state breadcrumbs', () => {
       'react-native': { AppState }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(_cb).toBe(undefined)
   })
@@ -80,8 +80,8 @@ describe('plugin: react native app state breadcrumbs', () => {
       'react-native': { AppState }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['state'] })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['state'], plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(typeof _cb).toBe('function')
   })
diff --git a/packages/plugin-react-native-connectivity-breadcrumbs/connectivity.js b/packages/plugin-react-native-connectivity-breadcrumbs/connectivity.js
index 4c2d8cb575..6a91e165ef 100644
--- a/packages/plugin-react-native-connectivity-breadcrumbs/connectivity.js
+++ b/packages/plugin-react-native-connectivity-breadcrumbs/connectivity.js
@@ -1,7 +1,7 @@
 const NetInfo = require('@react-native-community/netinfo')
 
 module.exports = {
-  init: client => {
+  load: client => {
     if (!client._config.enabledBreadcrumbTypes || !client._config.enabledBreadcrumbTypes.includes('state')) return
 
     NetInfo.addEventListener(({ isConnected, isInternetReachable, type }) => {
diff --git a/packages/plugin-react-native-connectivity-breadcrumbs/test/connectivity.test.js b/packages/plugin-react-native-connectivity-breadcrumbs/test/connectivity.test.js
index 89f4d1fbce..c41382fadf 100644
--- a/packages/plugin-react-native-connectivity-breadcrumbs/test/connectivity.test.js
+++ b/packages/plugin-react-native-connectivity-breadcrumbs/test/connectivity.test.js
@@ -16,8 +16,8 @@ describe('plugin: react native connectivity breadcrumbs', () => {
       '@react-native-community/netinfo': NetInfo
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(typeof _cb).toBe('function')
     expect(client._breadcrumbs.length).toBe(0)
@@ -46,8 +46,8 @@ describe('plugin: react native connectivity breadcrumbs', () => {
       '@react-native-community/netinfo': NetInfo
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: null })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: null, plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(_cb).toBe(undefined)
   })
@@ -63,8 +63,8 @@ describe('plugin: react native connectivity breadcrumbs', () => {
       '@react-native-community/netinfo': NetInfo
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(_cb).toBe(undefined)
   })
@@ -80,8 +80,8 @@ describe('plugin: react native connectivity breadcrumbs', () => {
       '@react-native-community/netinfo': NetInfo
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['state'] })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['state'], plugins: [plugin] })
+    expect(client).toBe(client)
 
     expect(typeof _cb).toBe('function')
   })
diff --git a/packages/plugin-react-native-global-error-handler/error-handler.js b/packages/plugin-react-native-global-error-handler/error-handler.js
index 0c2ce2f1b2..dbcbf69f22 100644
--- a/packages/plugin-react-native-global-error-handler/error-handler.js
+++ b/packages/plugin-react-native-global-error-handler/error-handler.js
@@ -2,8 +2,8 @@
 * Automatically notifies Bugsnag when React Native's global error handler is called
 */
 
-module.exports = {
-  init: (client, ErrorUtils = global.ErrorUtils) => {
+module.exports = (ErrorUtils = global.ErrorUtils) => ({
+  load: (client) => {
     if (!client._config.autoDetectErrors) return
     if (!client._config.enabledErrorTypes.unhandledExceptions) return
     if (!ErrorUtils) {
@@ -24,4 +24,4 @@ module.exports = {
       })
     })
   }
-}
+})
diff --git a/packages/plugin-react-native-global-error-handler/test/error-handler.test.js b/packages/plugin-react-native-global-error-handler/test/error-handler.test.js
index 6f7b6ccee1..7ba660df96 100644
--- a/packages/plugin-react-native-global-error-handler/test/error-handler.test.js
+++ b/packages/plugin-react-native-global-error-handler/test/error-handler.test.js
@@ -20,10 +20,10 @@ class MockErrorUtils {
 
 describe('plugin: react native global error handler', () => {
   it('should set a global error handler', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
     const eu = new MockErrorUtils()
-    client.use(plugin, eu)
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(eu)] })
     expect(typeof eu.getGlobalHandler()).toBe('function')
+    expect(client).toBe(client)
   })
 
   it('should warn if ErrorUtils is not defined', done => {
@@ -37,50 +37,53 @@ describe('plugin: react native global error handler', () => {
           done()
         },
         error: () => {}
-      }
+      },
+      plugins: [plugin()]
     })
-    client.use(plugin)
+    expect(client).toBe(client)
   })
 
   it('should not set a global error handler when autoDetectErrors=false', () => {
+    const eu = new MockErrorUtils()
     const client = new Client({
       apiKey: 'API_KEY_YEAH',
-      autoDetectErrors: false
+      autoDetectErrors: false,
+      plugins: [plugin(eu)]
     })
-    const eu = new MockErrorUtils()
-    client.use(plugin, eu)
     expect(eu.getGlobalHandler()).toBe(null)
+    expect(client).toBe(client)
   })
 
   it('should not set a global error handler when enabledErrorTypes.unhandledExceptions=false', () => {
+    const eu = new MockErrorUtils()
     const client = new Client({
       apiKey: 'API_KEY_YEAH',
-      enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: false }
+      enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: false },
+      plugins: [plugin(eu)]
     })
-    const eu = new MockErrorUtils()
-    client.use(plugin, eu)
     expect(eu.getGlobalHandler()).toBe(null)
+    expect(client).toBe(client)
   })
 
   it('should call through to an existing handler', done => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const eu = new MockErrorUtils()
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(eu)] })
     client._setDelivery(client => ({
       sendSession: () => {},
       sendEvent: (...args) => args[args.length - 1](null)
     }))
-    const eu = new MockErrorUtils()
     const error = new Error('floop')
     eu.setGlobalHandler(function (err, isFatal) {
       expect(err).toBe(error)
       expect(isFatal).toBe(true)
       done()
     })
-    client.use(plugin, eu)
     eu.getGlobalHandler()(error, true)
   })
 
   it('should have the correct handled state', done => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
+    const eu = new MockErrorUtils()
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(eu)] })
     client._setDelivery(client => ({
       sendSession: () => {},
       sendEvent: (payload, cb) => {
@@ -91,8 +94,6 @@ describe('plugin: react native global error handler', () => {
         done()
       }
     }))
-    const eu = new MockErrorUtils()
-    client.use(plugin, eu)
     eu._globalHandler(new Error('argh'))
   })
 })
diff --git a/packages/plugin-react-native-orientation-breadcrumbs/orientation.js b/packages/plugin-react-native-orientation-breadcrumbs/orientation.js
index aadca86cbe..af149f721f 100644
--- a/packages/plugin-react-native-orientation-breadcrumbs/orientation.js
+++ b/packages/plugin-react-native-orientation-breadcrumbs/orientation.js
@@ -1,7 +1,7 @@
 const { Dimensions } = require('react-native')
 
 module.exports = {
-  init: client => {
+  load: client => {
     if (!client._config.enabledBreadcrumbTypes || !client._config.enabledBreadcrumbTypes.includes('state')) return
 
     let lastOrientation
diff --git a/packages/plugin-react-native-orientation-breadcrumbs/test/orientation.test.js b/packages/plugin-react-native-orientation-breadcrumbs/test/orientation.test.js
index 4e61113cff..7260d7242c 100644
--- a/packages/plugin-react-native-orientation-breadcrumbs/test/orientation.test.js
+++ b/packages/plugin-react-native-orientation-breadcrumbs/test/orientation.test.js
@@ -18,11 +18,8 @@ describe('plugin: react native orientation breadcrumbs', () => {
       'react-native': { Dimensions }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-
     currentDimensions = { height: 100, width: 200 }
-
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', plugins: [plugin] })
 
     expect(typeof _cb).toBe('function')
     expect(client._breadcrumbs.length).toBe(0)
@@ -55,10 +52,10 @@ describe('plugin: react native orientation breadcrumbs', () => {
       'react-native': { Dimensions }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: null })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: null, plugins: [plugin] })
 
     expect(_cb).toBe(undefined)
+    expect(client).toBe(client)
   })
 
   it('should not be enabled when enabledBreadcrumbTypes=[]', () => {
@@ -72,10 +69,10 @@ describe('plugin: react native orientation breadcrumbs', () => {
       'react-native': { Dimensions }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [] })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: [], plugins: [plugin] })
 
     expect(_cb).toBe(undefined)
+    expect(client).toBe(client)
   })
 
   it('should be enabled when enabledBreadcrumbTypes=["state"]', () => {
@@ -90,9 +87,9 @@ describe('plugin: react native orientation breadcrumbs', () => {
       'react-native': { Dimensions }
     })
 
-    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['state'] })
-    client.use(plugin)
+    const client = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa', enabledBreadcrumbTypes: ['state'], plugins: [plugin] })
 
     expect(typeof _cb).toBe('function')
+    expect(client).toBe(client)
   })
 })
diff --git a/packages/plugin-react-native-unhandled-rejection/rejection-handler.js b/packages/plugin-react-native-unhandled-rejection/rejection-handler.js
index 0e2941b2a8..9fe605d995 100644
--- a/packages/plugin-react-native-unhandled-rejection/rejection-handler.js
+++ b/packages/plugin-react-native-unhandled-rejection/rejection-handler.js
@@ -5,7 +5,7 @@
 const rnPromise = require('promise/setimmediate/rejection-tracking')
 
 module.exports = {
-  init: (client) => {
+  load: (client) => {
     if (!client._config.autoDetectErrors || !client._config.enabledErrorTypes.unhandledRejections) return () => {}
     rnPromise.enable({
       allRejections: true,
diff --git a/packages/plugin-react-native-unhandled-rejection/test/rejection-handler.test.ts b/packages/plugin-react-native-unhandled-rejection/test/rejection-handler.test.ts
index 49fd9ed998..cf7e8f5e46 100644
--- a/packages/plugin-react-native-unhandled-rejection/test/rejection-handler.test.ts
+++ b/packages/plugin-react-native-unhandled-rejection/test/rejection-handler.test.ts
@@ -21,7 +21,7 @@ describe('plugin: react native rejection handler', () => {
         done()
       }
     }))
-    const stop = plugin.init(c)
+    const stop = plugin.load(c)
     // in the interests of keeping the tests quick, TypeErrors get rejected quicker
     // see: https://github.com/then/promise/blob/d980ed01b7a383bfec416c96095e2f40fd18ab34/src/rejection-tracking.js#L48-L54
     try {
@@ -42,7 +42,7 @@ describe('plugin: react native rejection handler', () => {
         done(new Error('event should not be sent when autoDetectErrors=false'))
       }
     }))
-    const stop = plugin.init(c)
+    const stop = plugin.load(c)
     try {
       // @ts-ignore
       String.floop()
@@ -65,7 +65,7 @@ describe('plugin: react native rejection handler', () => {
         done(new Error('event should not be sent when enabledErrorTypes.unhandledRejections=false'))
       }
     }))
-    const stop = plugin.init(c)
+    const stop = plugin.load(c)
     try {
       // @ts-ignore
       String.floop()
diff --git a/packages/plugin-react/src/index.js b/packages/plugin-react/src/index.js
index 2644eb837e..e05c50152c 100644
--- a/packages/plugin-react/src/index.js
+++ b/packages/plugin-react/src/index.js
@@ -1,7 +1,12 @@
-module.exports = {
-  name: 'react',
-  init: (client, React = window.React) => {
+module.exports = class BugsnagReactPlugin {
+  constructor (React = window.React) {
     if (!React) throw new Error('cannot find React')
+    this.React = React
+    this.name = 'react'
+  }
+
+  load (client) {
+    const React = this.React
 
     class ErrorBoundary extends React.Component {
       constructor (props) {
diff --git a/packages/plugin-react/src/test/index.test.js b/packages/plugin-react/src/test/index.test.js
index d40685e82c..33fee79858 100644
--- a/packages/plugin-react/src/test/index.test.js
+++ b/packages/plugin-react/src/test/index.test.js
@@ -2,7 +2,7 @@
 
 import React from 'react'
 import renderer from 'react-test-renderer'
-import plugin from '../'
+import BugsnagPluginReact from '../'
 
 class Event {
   addMetadata () {
@@ -19,7 +19,8 @@ bugsnag.Event.create = jest.fn(function () {
   return new Event()
 })
 
-const ErrorBoundary = plugin.init(bugsnag, React)
+const plugin = new BugsnagPluginReact(React)
+const ErrorBoundary = plugin.load(bugsnag)
 
 beforeEach(() => {
   bugsnag._notify.mockReset()
@@ -29,7 +30,7 @@ test('formatComponentStack(str)', () => {
   const str = `
   in BadButton
   in ErrorBoundary`
-  expect(plugin.formatComponentStack(str))
+  expect(BugsnagPluginReact.formatComponentStack(str))
     .toBe('in BadButton\nin ErrorBoundary')
 })
 
diff --git a/packages/plugin-react/types/bugsnag-react.d.ts b/packages/plugin-react/types/bugsnag-react.d.ts
index a67fe0e319..9e80061cdc 100644
--- a/packages/plugin-react/types/bugsnag-react.d.ts
+++ b/packages/plugin-react/types/bugsnag-react.d.ts
@@ -1,3 +1,8 @@
-import { Bugsnag } from '@bugsnag/browser'
-declare const bugsnagPluginReact: Bugsnag.Plugin
-export default bugsnagPluginReact
+import { Plugin } from '@bugsnag/browser'
+import React from 'react'
+
+declare class BugsnagPluginReact extends Plugin {
+  constructor(React?: React)
+}
+
+export default BugsnagPluginReact
diff --git a/packages/plugin-restify/src/restify.js b/packages/plugin-restify/src/restify.js
index 2073911006..58f61c3087 100644
--- a/packages/plugin-restify/src/restify.js
+++ b/packages/plugin-restify/src/restify.js
@@ -12,7 +12,7 @@ const handledState = {
 
 module.exports = {
   name: 'restify',
-  init: client => {
+  load: client => {
     const requestHandler = (req, res, next) => {
       const dom = domain.create()
 
diff --git a/packages/plugin-restify/test/restify.test.js b/packages/plugin-restify/test/restify.test.js
index eea1bf71ee..41cbe413aa 100644
--- a/packages/plugin-restify/test/restify.test.js
+++ b/packages/plugin-restify/test/restify.test.js
@@ -5,8 +5,7 @@ const plugin = require('../')
 
 describe('plugin: restify', () => {
   it('exports two middleware functions', () => {
-    const c = new Client({ apiKey: 'api_key' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'api_key', plugins: [plugin] })
     const middleware = c.getPlugin('restify')
     expect(typeof middleware.requestHandler).toBe('function')
     expect(middleware.requestHandler.length).toBe(3)
diff --git a/packages/plugin-server-session/session.js b/packages/plugin-server-session/session.js
index 4456b33094..491548a117 100644
--- a/packages/plugin-server-session/session.js
+++ b/packages/plugin-server-session/session.js
@@ -5,7 +5,7 @@ const Backoff = require('backo')
 const runSyncCallbacks = require('@bugsnag/core/lib/sync-callback-runner')
 
 module.exports = {
-  init: (client) => {
+  load: (client) => {
     const sessionTracker = new SessionTracker(client._config.sessionSummaryInterval)
     sessionTracker.on('summary', sendSessionSummary(client))
     sessionTracker.start()
diff --git a/packages/plugin-server-session/test/session.test.ts b/packages/plugin-server-session/test/session.test.ts
index 1623b0fab1..91f31da90d 100644
--- a/packages/plugin-server-session/test/session.test.ts
+++ b/packages/plugin-server-session/test/session.test.ts
@@ -12,9 +12,9 @@ describe('plugin: server sessions', () => {
   beforeEach(() => {
     class TrackerMock extends EventEmitter {
       start () {
-        this.emit('summary', [
+        setTimeout(() => this.emit('summary', [
           { startedAt: '2017-12-12T13:54:00.000Z', sessionsStarted: 123 }
-        ])
+        ]))
       }
 
       stop () {}
@@ -23,8 +23,9 @@ describe('plugin: server sessions', () => {
 
     Tracker.mockImplementation(() => new TrackerMock() as any)
   })
+
   it('should send the session', done => {
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' }, undefined, [plugin])
     c._setDelivery(client => ({
       sendEvent: () => {},
       sendSession: (session: any, cb = () => {}) => {
@@ -34,7 +35,6 @@ describe('plugin: server sessions', () => {
       }
     }))
 
-    c.use(plugin)
     c.startSession()
   })
 
@@ -54,7 +54,7 @@ describe('plugin: server sessions', () => {
       endpoints: { notify: 'bloo', sessions: 'blah' },
       releaseStage: 'qa',
       enabledReleaseStages: ['production']
-    })
+    }, undefined, [plugin])
     c._setDelivery(client => ({
       sendEvent: () => {},
       sendSession: (session: any, cb = () => {}) => {
@@ -62,7 +62,6 @@ describe('plugin: server sessions', () => {
       }
     }))
 
-    c.use(plugin)
     c.startSession()
   })
 
@@ -75,7 +74,7 @@ describe('plugin: server sessions', () => {
       releaseStage: 'qa',
       appType: 'server',
       appVersion: '1.2.3'
-    })
+    }, undefined, [plugin])
 
     // this is normally set by a plugin
     c._addOnSessionPayload(sp => {
@@ -94,7 +93,6 @@ describe('plugin: server sessions', () => {
       }
     }))
 
-    c.use(plugin)
     c.startSession()
   })
 
@@ -106,8 +104,7 @@ describe('plugin: server sessions', () => {
     }
     Tracker.mockImplementation(() => new TrackerMock() as any)
 
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' }, undefined, [plugin])
 
     c.leaveBreadcrumb('tick')
     c._metadata = { datetime: { tz: 'GMT+1' } }
@@ -131,8 +128,7 @@ describe('plugin: server sessions', () => {
     }
     Tracker.mockImplementation(() => new TrackerMock() as any)
 
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' }, undefined, [plugin])
 
     // start a session and get its id
     const sessionClient = c.startSession()
diff --git a/packages/plugin-simple-throttle/test/throttle.test.js b/packages/plugin-simple-throttle/test/throttle.test.js
index a43fcafcfa..0aa22f6f8c 100644
--- a/packages/plugin-simple-throttle/test/throttle.test.js
+++ b/packages/plugin-simple-throttle/test/throttle.test.js
@@ -7,8 +7,7 @@ const Client = require('@bugsnag/core/client')
 describe('plugin: throttle', () => {
   it('prevents more than maxEvents being sent', () => {
     const payloads = []
-    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' })
-    c.use(plugin)
+    const c = new Client({ apiKey: 'aaaa-aaaa-aaaa-aaaa' }, undefined, [plugin])
     c._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
     for (let i = 0; i < 100; i++) c.notify(new Error('This is fail'))
     expect(payloads.length).toBe(10)
diff --git a/packages/plugin-simple-throttle/throttle.js b/packages/plugin-simple-throttle/throttle.js
index 94db93ff79..d1333b8b28 100644
--- a/packages/plugin-simple-throttle/throttle.js
+++ b/packages/plugin-simple-throttle/throttle.js
@@ -5,7 +5,7 @@ const intRange = require('@bugsnag/core/lib/validators/int-range')
  */
 
 module.exports = {
-  init: (client) => {
+  load: (client) => {
     // track sent events for each init of the plugin
     let n = 0
 
diff --git a/packages/plugin-strip-project-root/strip-project-root.js b/packages/plugin-strip-project-root/strip-project-root.js
index 1d47c1b005..b9515b8975 100644
--- a/packages/plugin-strip-project-root/strip-project-root.js
+++ b/packages/plugin-strip-project-root/strip-project-root.js
@@ -1,7 +1,7 @@
 const normalizePath = require('@bugsnag/core/lib/path-normalizer')
 
 module.exports = {
-  init: client => client.addOnError(event => {
+  load: client => client.addOnError(event => {
     if (!client._config.projectRoot) return
     const projectRoot = normalizePath(client._config.projectRoot)
     const allFrames = event.errors.reduce((accum, er) => accum.concat(er.stacktrace), [])
diff --git a/packages/plugin-strip-project-root/test/strip-project-root.test.js b/packages/plugin-strip-project-root/test/strip-project-root.test.js
index 6a33c9072b..203d7561dc 100644
--- a/packages/plugin-strip-project-root/test/strip-project-root.test.js
+++ b/packages/plugin-strip-project-root/test/strip-project-root.test.js
@@ -8,7 +8,7 @@ const { schema } = require('@bugsnag/core/config')
 
 describe('plugin: strip project root', () => {
   it('should remove the project root if it matches the start of the stackframe’s file', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -28,8 +28,6 @@ describe('plugin: strip project root', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'strip project root test', [
       {
         lineNumber: 22,
@@ -48,7 +46,7 @@ describe('plugin: strip project root', () => {
   })
 
   it('should not remove a matching substring if it is not at the start', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -68,8 +66,6 @@ describe('plugin: strip project root', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'strip project root test', [
       {
         lineNumber: 22,
@@ -88,7 +84,7 @@ describe('plugin: strip project root', () => {
   })
 
   it('should work with node_modules and node internals', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -107,8 +103,6 @@ describe('plugin: strip project root', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'strip project root test', [
       {
         lineNumber: 22,
@@ -123,7 +117,7 @@ describe('plugin: strip project root', () => {
   })
 
   it('should tolerate stackframe.file not being a string', done => {
-    const client = new Client({ apiKey: 'api_key', projectRoot: '/app' }, {
+    const client = new Client({ apiKey: 'api_key', projectRoot: '/app', plugins: [plugin] }, {
       ...schema,
       projectRoot: {
         validate: () => true,
@@ -143,8 +137,6 @@ describe('plugin: strip project root', () => {
       sendSession: () => {}
     }))
 
-    client.use(plugin)
-
     client._notify(new Event('Error', 'strip project root test', [
       {
         lineNumber: 22,
diff --git a/packages/plugin-strip-query-string/strip-query-string.js b/packages/plugin-strip-query-string/strip-query-string.js
index 359a9c4b1b..c5c15b6836 100644
--- a/packages/plugin-strip-query-string/strip-query-string.js
+++ b/packages/plugin-strip-query-string/strip-query-string.js
@@ -5,7 +5,7 @@ const map = require('@bugsnag/core/lib/es-utils/map')
 const reduce = require('@bugsnag/core/lib/es-utils/reduce')
 
 module.exports = {
-  init: (client) => {
+  load: (client) => {
     client.addOnError(event => {
       const allFrames = reduce(event.errors, (accum, er) => accum.concat(er.stacktrace), [])
       map(allFrames, frame => {
diff --git a/packages/plugin-strip-query-string/test/strip-query-string.test.js b/packages/plugin-strip-query-string/test/strip-query-string.test.js
index 82d98f727b..cf8812b949 100644
--- a/packages/plugin-strip-query-string/test/strip-query-string.test.js
+++ b/packages/plugin-strip-query-string/test/strip-query-string.test.js
@@ -35,11 +35,11 @@ describe('plugin: strip query string', () => {
       apiKey: 'API_KEY_YEAH',
       onError: event => {
         originalStacktrace = event.errors[0].stacktrace.map(f => ({ ...f }))
-      }
+      },
+      plugins: [plugin]
     })
     const payloads = []
     let originalStacktrace
-    client.use(plugin)
 
     client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
     const err = new Error('noooo')
diff --git a/packages/plugin-vue/src/index.js b/packages/plugin-vue/src/index.js
index 3665a1c4df..aa1b379b38 100644
--- a/packages/plugin-vue/src/index.js
+++ b/packages/plugin-vue/src/index.js
@@ -1,7 +1,12 @@
-module.exports = {
-  name: 'vue',
-  init: (client, Vue = window.Vue) => {
+module.exports = class BugsnagVuePlugin {
+  constructor (Vue = window.Vue) {
     if (!Vue) throw new Error('cannot find Vue')
+    this.Vue = Vue
+    this.name = 'vue'
+  }
+
+  load (client) {
+    const Vue = this.Vue
     const prev = Vue.config.errorHandler
 
     const handler = (err, vm, info) => {
diff --git a/packages/plugin-vue/test/index.test.js b/packages/plugin-vue/test/index.test.js
index d9b6643a1c..f3c5376ad3 100644
--- a/packages/plugin-vue/test/index.test.js
+++ b/packages/plugin-vue/test/index.test.js
@@ -1,16 +1,17 @@
 const { describe, it, expect } = global
-const plugin = require('../src')
+const BugsnagVuePlugin = require('../src')
 const Client = require('@bugsnag/core/client')
 
 describe('bugsnag vue', () => {
   it('throws when missing Vue', () => {
     expect(() => {
-      plugin.init(new Client({ apiKey: 'API_KEYYY' }))
+      new BugsnagVuePlugin().load(new Client({ apiKey: 'API_KEYYY' }))
     }).toThrow()
   })
 
   it('installs Vue.config.errorHandler', done => {
-    const client = new Client({ apiKey: 'API_KEYYY' })
+    const Vue = { config: {} }
+    const client = new Client({ apiKey: 'API_KEYYY', plugins: [new BugsnagVuePlugin(Vue)] })
     client._setDelivery(client => ({
       sendEvent: (payload) => {
         expect(payload.events[0].errors[0].errorClass).toBe('Error')
@@ -19,14 +20,12 @@ describe('bugsnag vue', () => {
         done()
       }
     }))
-    const Vue = { config: {} }
-    client.use(plugin, Vue)
     expect(typeof Vue.config.errorHandler).toBe('function')
     Vue.config.errorHandler(new Error('oops'), { $root: true, $options: {} }, 'callback for watcher "fooBarBaz"')
   })
 
   it('bugsnag vue: classify(str)', () => {
-    expect(plugin.classify('foo_bar')).toBe('FooBar')
-    expect(plugin.classify('foo-bar')).toBe('FooBar')
+    expect(BugsnagVuePlugin.classify('foo_bar')).toBe('FooBar')
+    expect(BugsnagVuePlugin.classify('foo-bar')).toBe('FooBar')
   })
 })
diff --git a/packages/plugin-vue/types/bugsnag-vue.d.ts b/packages/plugin-vue/types/bugsnag-vue.d.ts
index 7da1bbcdb3..048af28dd3 100644
--- a/packages/plugin-vue/types/bugsnag-vue.d.ts
+++ b/packages/plugin-vue/types/bugsnag-vue.d.ts
@@ -1,3 +1,8 @@
-import { Bugsnag } from '@bugsnag/browser'
-declare const bugsnagPluginVue: Bugsnag.Plugin
+import { Plugin } from '@bugsnag/browser'
+import Vue from 'vue'
+
+declare class BugsnagPluginVue extends Plugin {
+  constructor(Vue?: Vue)
+}
+
 export default bugsnagPluginVue
diff --git a/packages/plugin-window-onerror/onerror.js b/packages/plugin-window-onerror/onerror.js
index d25de6ec09..4ae1c1781a 100644
--- a/packages/plugin-window-onerror/onerror.js
+++ b/packages/plugin-window-onerror/onerror.js
@@ -2,8 +2,8 @@
  * Automatically notifies Bugsnag when window.onerror is called
  */
 
-module.exports = {
-  init: (client, win = window) => {
+module.exports = (win = window) => ({
+  load: (client) => {
     if (!client._config.autoDetectErrors) return
     if (!client._config.enabledErrorTypes.unhandledExceptions) return
     function onerror (messageOrEvent, url, lineNo, charNo, error) {
@@ -66,7 +66,7 @@ module.exports = {
     const prevOnError = win.onerror
     win.onerror = onerror
   }
-}
+})
 
 // Sometimes the stacktrace has less information than was passed to window.onerror.
 // This function will augment the first stackframe with any useful info that was
diff --git a/packages/plugin-window-onerror/test/onerror.test.js b/packages/plugin-window-onerror/test/onerror.test.js
index dcf4634e0c..3a28aca8e3 100644
--- a/packages/plugin-window-onerror/test/onerror.test.js
+++ b/packages/plugin-window-onerror/test/onerror.test.js
@@ -10,15 +10,15 @@ describe('plugin: window onerror', () => {
   beforeEach(() => { window = {} })
 
   it('should set a window.onerror event handler', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH' })
-    client.use(plugin, window)
+    const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
     expect(typeof window.onerror).toBe('function')
+    expect(client).toBe(client)
   })
 
   it('should not add a window.onerror event handler when autoDetectErrors=false', () => {
-    const client = new Client({ apiKey: 'API_KEY_YEAH', autoDetectErrors: false })
-    client.use(plugin, window)
+    const client = new Client({ apiKey: 'API_KEY_YEAH', autoDetectErrors: false, plugins: [plugin(window)] })
     expect(window.onerror).toBe(undefined)
+    expect(client).toBe(client)
   })
 
   it('should not add a window.onerror event handler when enabledErrorTypes.unhandledExceptions=false', () => {
@@ -27,17 +27,17 @@ describe('plugin: window onerror', () => {
       enabledErrorTypes: {
         unhandledExceptions: false,
         unhandledRejections: false
-      }
+      },
+      plugins: [plugin(window)]
     })
-    client.use(plugin, window)
     expect(window.onerror).toBe(undefined)
+    expect(client).toBe(client)
   })
 
   describe('window.onerror function', () => {
     it('captures uncaught errors in timer callbacks', done => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       window.onerror('Uncaught Error: Bad things', 'foo.js', 10, 20, new Error('Bad things'))
@@ -84,18 +84,16 @@ describe('plugin: window onerror', () => {
     it('calls any previously registered window.onerror callback', done => {
       window.onerror = () => done()
 
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       window.onerror('Uncaught Error: Bad things', 'foo.js', 10, 20, new Error('Bad things'))
     })
 
     it('handles single argument usage of window.onerror', () => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       const evt = { type: 'error', detail: 'something bad happened' }
@@ -111,9 +109,8 @@ describe('plugin: window onerror', () => {
     })
 
     it('handles single argument usage of window.onerror with extra parameter', () => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       // this situation is caused by the following kind of jQuery call:
@@ -190,9 +187,8 @@ describe('plugin: window onerror', () => {
     // }
 
     it('extracts meaning from non-error values as error messages', function (done) {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       // call onerror as it would be when `throw 'hello' is run`
@@ -225,9 +221,8 @@ describe('plugin: window onerror', () => {
         expect(payloads.length).toBe(1)
         done()
       }
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       // call onerror as it would be when `throw 'hello' is run`
@@ -245,9 +240,8 @@ describe('plugin: window onerror', () => {
         expect(payloads.length).toBe(0)
         done()
       }
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [plugin(window)] })
       const payloads = []
-      client.use(plugin, window)
       client._setDelivery(client => ({ sendEvent: (payload) => payloads.push(payload) }))
 
       // call onerror as it would be when `throw 'hello' is run`
diff --git a/packages/plugin-window-unhandled-rejection/test/unhandled-rejection.test.js b/packages/plugin-window-unhandled-rejection/test/unhandled-rejection.test.js
index 4cdfc1047e..df0b63a774 100644
--- a/packages/plugin-window-unhandled-rejection/test/unhandled-rejection.test.js
+++ b/packages/plugin-window-unhandled-rejection/test/unhandled-rejection.test.js
@@ -17,15 +17,15 @@ const window = {
 describe('plugin: unhandled rejection', () => {
   describe('window.onunhandledrejection function', () => {
     it('captures unhandled promise rejections', done => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
-      client.use(plugin, window)
+      const p = plugin(window)
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [p] })
       client._setDelivery(client => ({
         sendEvent: (payload) => {
           const event = payload.events[0].toJSON()
           expect(event.severity).toBe('error')
           expect(event.unhandled).toBe(true)
           expect(event.severityReason).toEqual({ type: 'unhandledPromiseRejection' })
-          plugin.destroy(window)
+          p.destroy(window)
           done()
         }
       }))
@@ -35,8 +35,8 @@ describe('plugin: unhandled rejection', () => {
     })
 
     it('handles bad user input', done => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
-      client.use(plugin, window)
+      const p = plugin(window)
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [p] })
       client._setDelivery(client => ({
         sendEvent: (payload) => {
           const event = payload.events[0].toJSON()
@@ -46,7 +46,7 @@ describe('plugin: unhandled rejection', () => {
           expect(event.exceptions[0].message).toBe('unhandledrejection handler received a non-error. See "unhandledrejection handler" tab for more detail.')
           expect(event.severityReason).toEqual({ type: 'unhandledPromiseRejection' })
           expect(event.metaData['unhandledrejection handler']['non-error parameter']).toEqual('null')
-          plugin.destroy(window)
+          p.destroy(window)
           done()
         }
       }))
@@ -98,8 +98,8 @@ describe('plugin: unhandled rejection', () => {
     // })
 
     it('handles errors with non-string stacks', done => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
-      client.use(plugin, window)
+      const p = plugin(window)
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [p] })
       client._setDelivery(client => ({
         sendEvent: (payload) => {
           const event = payload.events[0].toJSON()
@@ -108,7 +108,7 @@ describe('plugin: unhandled rejection', () => {
           expect(event.exceptions[0].errorClass).toBe('Error')
           expect(event.exceptions[0].message).toBe('blah')
           expect(event.severityReason).toEqual({ type: 'unhandledPromiseRejection' })
-          plugin.destroy(window)
+          p.destroy(window)
           done()
         }
       }))
@@ -119,8 +119,8 @@ describe('plugin: unhandled rejection', () => {
     })
 
     it('tolerates event.detail propties which throw', done => {
-      const client = new Client({ apiKey: 'API_KEY_YEAH' })
-      client.use(plugin, window)
+      const p = plugin(window)
+      const client = new Client({ apiKey: 'API_KEY_YEAH', plugins: [p] })
       client._setDelivery(client => ({
         sendEvent: (payload) => {
           const event = payload.events[0].toJSON()
@@ -129,7 +129,7 @@ describe('plugin: unhandled rejection', () => {
           expect(event.exceptions[0].errorClass).toBe('Error')
           expect(event.exceptions[0].message).toBe('blah')
           expect(event.severityReason).toEqual({ type: 'unhandledPromiseRejection' })
-          plugin.destroy(window)
+          p.destroy(window)
           done()
         }
       }))
@@ -147,9 +147,9 @@ describe('plugin: unhandled rejection', () => {
         addEventListener: () => {}
       }
       const addEventListenerSpy = spyOn(window, 'addEventListener')
-      const client = new Client({ apiKey: 'API_KEY_YEAH', autoDetectErrors: false })
-      client.use(plugin, window)
+      const client = new Client({ apiKey: 'API_KEY_YEAH', autoDetectErrors: false, plugins: [plugin(window)] })
       expect(addEventListenerSpy).toHaveBeenCalledTimes(0)
+      expect(client).toBe(client)
     })
 
     it('is disabled when enabledErrorTypes.unhandledRejections=false', () => {
@@ -159,10 +159,11 @@ describe('plugin: unhandled rejection', () => {
       const addEventListenerSpy = spyOn(window, 'addEventListener')
       const client = new Client({
         apiKey: 'API_KEY_YEAH',
-        enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: false }
+        enabledErrorTypes: { unhandledExceptions: false, unhandledRejections: false },
+        plugins: [plugin(window)]
       })
-      client.use(plugin, window)
       expect(addEventListenerSpy).toHaveBeenCalledTimes(0)
+      expect(client).toBe(client)
     })
   })
 })
diff --git a/packages/plugin-window-unhandled-rejection/unhandled-rejection.js b/packages/plugin-window-unhandled-rejection/unhandled-rejection.js
index 4d2f1d21ad..f766ab2707 100644
--- a/packages/plugin-window-unhandled-rejection/unhandled-rejection.js
+++ b/packages/plugin-window-unhandled-rejection/unhandled-rejection.js
@@ -1,67 +1,73 @@
 const map = require('@bugsnag/core/lib/es-utils/map')
 const isError = require('@bugsnag/core/lib/iserror')
 
+let _listener
 /*
  * Automatically notifies Bugsnag when window.onunhandledrejection is called
  */
-let _listener
-exports.init = (client, win = window) => {
-  if (!client._config.autoDetectErrors || !client._config.enabledErrorTypes.unhandledRejections) return
-  const listener = evt => {
-    let error = evt.reason
-    let isBluebird = false
+module.exports = (win = window) => {
+  const plugin = {
+    load: (client) => {
+      if (!client._config.autoDetectErrors || !client._config.enabledErrorTypes.unhandledRejections) return
+      const listener = evt => {
+        let error = evt.reason
+        let isBluebird = false
 
-    // accessing properties on evt.detail can throw errors (see #394)
-    try {
-      if (evt.detail && evt.detail.reason) {
-        error = evt.detail.reason
-        isBluebird = true
-      }
-    } catch (e) {}
+        // accessing properties on evt.detail can throw errors (see #394)
+        try {
+          if (evt.detail && evt.detail.reason) {
+            error = evt.detail.reason
+            isBluebird = true
+          }
+        } catch (e) {}
 
-    const event = client.Event.create(error, false, {
-      severity: 'error',
-      unhandled: true,
-      severityReason: { type: 'unhandledPromiseRejection' }
-    }, 'unhandledrejection handler', 1, client._logger)
+        const event = client.Event.create(error, false, {
+          severity: 'error',
+          unhandled: true,
+          severityReason: { type: 'unhandledPromiseRejection' }
+        }, 'unhandledrejection handler', 1, client._logger)
 
-    if (isBluebird) {
-      map(event.errors[0].stacktrace, fixBluebirdStacktrace(error))
-    }
+        if (isBluebird) {
+          map(event.errors[0].stacktrace, fixBluebirdStacktrace(error))
+        }
 
-    client._notify(event, (event) => {
-      if (isError(event.originalError) && !event.originalError.stack) {
-        event.addMetadata('unhandledRejection handler', {
-          [Object.prototype.toString.call(event.originalError)]: {
-            name: event.originalError.name,
-            message: event.originalError.message,
-            code: event.originalError.code
+        client._notify(event, (event) => {
+          if (isError(event.originalError) && !event.originalError.stack) {
+            event.addMetadata('unhandledRejection handler', {
+              [Object.prototype.toString.call(event.originalError)]: {
+                name: event.originalError.name,
+                message: event.originalError.message,
+                code: event.originalError.code
+              }
+            })
           }
         })
       }
-    })
-  }
-  if ('addEventListener' in win) {
-    win.addEventListener('unhandledrejection', listener)
-  } else {
-    win.onunhandledrejection = (reason, promise) => {
-      listener({ detail: { reason, promise } })
+      if ('addEventListener' in win) {
+        win.addEventListener('unhandledrejection', listener)
+      } else {
+        win.onunhandledrejection = (reason, promise) => {
+          listener({ detail: { reason, promise } })
+        }
+      }
+      _listener = listener
     }
   }
-  _listener = listener
-}
 
-if (process.env.NODE_ENV !== 'production') {
-  exports.destroy = (win = window) => {
-    if (_listener) {
-      if ('addEventListener' in win) {
-        win.removeEventListener('unhandledrejection', _listener)
-      } else {
-        win.onunhandledrejection = null
+  if (process.env.NODE_ENV !== 'production') {
+    plugin.destroy = (win = window) => {
+      if (_listener) {
+        if ('addEventListener' in win) {
+          win.removeEventListener('unhandledrejection', _listener)
+        } else {
+          win.onunhandledrejection = null
+        }
       }
+      _listener = null
     }
-    _listener = null
   }
+
+  return plugin
 }
 
 // The stack parser on bluebird stacks in FF get a suprious first frame:
diff --git a/test/browser/features/fixtures/plugin_react/webpack4/src/app.js b/test/browser/features/fixtures/plugin_react/webpack4/src/app.js
index bb67d39682..0664f64968 100644
--- a/test/browser/features/fixtures/plugin_react/webpack4/src/app.js
+++ b/test/browser/features/fixtures/plugin_react/webpack4/src/app.js
@@ -1,11 +1,9 @@
 var Bugsnag = require('@bugsnag/browser')
-var bugsnagReact = require('@bugsnag/plugin-react')
-var React = require('react')
 var ReactDOM = require('react-dom')
+var React = require('react')
 var config = require('./lib/config')
 
 Bugsnag.start(config)
-Bugsnag.use(bugsnagReact, React)
 
 var ErrorBoundary = Bugsnag.getPlugin('react')
 
diff --git a/test/browser/features/fixtures/plugin_react/webpack4/src/lib/config.js b/test/browser/features/fixtures/plugin_react/webpack4/src/lib/config.js
index 2ffdefdd51..f28950b68f 100644
--- a/test/browser/features/fixtures/plugin_react/webpack4/src/lib/config.js
+++ b/test/browser/features/fixtures/plugin_react/webpack4/src/lib/config.js
@@ -1,5 +1,9 @@
+var BugsnagReactPlugin = require('@bugsnag/plugin-react')
+var React = require('react')
+
 var ENDPOINT = decodeURIComponent(window.location.search.match(/ENDPOINT=([^&]+)/)[1])
 var API_KEY = decodeURIComponent(window.location.search.match(/API_KEY=([^&]+)/)[1])
 
 exports.apiKey = API_KEY
-exports.endpoints = { notify: ENDPOINT, sessions: '/noop' }
\ No newline at end of file
+exports.endpoints = { notify: ENDPOINT, sessions: '/noop' }
+exports.plugins = [new BugsnagReactPlugin(React)]
diff --git a/test/browser/features/fixtures/plugin_vue/webpack4/src/app.js b/test/browser/features/fixtures/plugin_vue/webpack4/src/app.js
index b8449f3260..b63b59bbf1 100644
--- a/test/browser/features/fixtures/plugin_vue/webpack4/src/app.js
+++ b/test/browser/features/fixtures/plugin_vue/webpack4/src/app.js
@@ -1,10 +1,8 @@
 var Bugsnag = require('@bugsnag/browser')
-var bugsnagVue = require('@bugsnag/plugin-vue')
-var Vue = require('vue/dist/vue.common.js')
 var config = require('./lib/config')
+var Vue = require('vue/dist/vue.common.js')
 
 Bugsnag.start(config)
-Bugsnag.use(bugsnagVue, Vue)
 
 var app = new Vue({
   el: '#app',
diff --git a/test/browser/features/fixtures/plugin_vue/webpack4/src/lib/config.js b/test/browser/features/fixtures/plugin_vue/webpack4/src/lib/config.js
index 505caa3d53..77c7308607 100644
--- a/test/browser/features/fixtures/plugin_vue/webpack4/src/lib/config.js
+++ b/test/browser/features/fixtures/plugin_vue/webpack4/src/lib/config.js
@@ -1,6 +1,9 @@
+var Vue = require('vue/dist/vue.common.js')
+var BugsnagVuePlugin = require('@bugsnag/plugin-vue')
 
 var ENDPOINT = decodeURIComponent(window.location.search.match(/ENDPOINT=([^&]+)/)[1])
 var API_KEY = decodeURIComponent(window.location.search.match(/API_KEY=([^&]+)/)[1])
 
 exports.apiKey = API_KEY
 exports.endpoints = { notify: ENDPOINT, sessions: '/noop' }
+exports.plugins = [new BugsnagVuePlugin(Vue)]
diff --git a/test/node/features/fixtures/connect/scenarios/app.js b/test/node/features/fixtures/connect/scenarios/app.js
index 8cc17ce6fd..f51562ef08 100644
--- a/test/node/features/fixtures/connect/scenarios/app.js
+++ b/test/node/features/fixtures/connect/scenarios/app.js
@@ -7,9 +7,9 @@ Bugsnag.start({
   endpoints: {
     notify: process.env.BUGSNAG_NOTIFY_ENDPOINT,
     sessions: process.env.BUGSNAG_SESSIONS_ENDPOINT
-  }
+  },
+  plugins: [bugsnagExpress]
 })
-Bugsnag.use(bugsnagExpress)
 
 var middleware = Bugsnag.getPlugin('express')
 
diff --git a/test/node/features/fixtures/express/scenarios/app.js b/test/node/features/fixtures/express/scenarios/app.js
index e473e0ad12..b230458ff6 100644
--- a/test/node/features/fixtures/express/scenarios/app.js
+++ b/test/node/features/fixtures/express/scenarios/app.js
@@ -7,10 +7,10 @@ Bugsnag.start({
   endpoints: {
     notify: process.env.BUGSNAG_NOTIFY_ENDPOINT,
     sessions: process.env.BUGSNAG_SESSIONS_ENDPOINT
-  }
+  },
+  plugins: [bugsnagExpress]
 })
 
-Bugsnag.use(bugsnagExpress)
 
 var middleware = Bugsnag.getPlugin('express')
 
diff --git a/test/node/features/fixtures/koa-1x/scenarios/app.js b/test/node/features/fixtures/koa-1x/scenarios/app.js
index 1d1b793229..2ecc9a8e05 100644
--- a/test/node/features/fixtures/koa-1x/scenarios/app.js
+++ b/test/node/features/fixtures/koa-1x/scenarios/app.js
@@ -7,10 +7,10 @@ Bugsnag.start({
   endpoints: {
     notify: process.env.BUGSNAG_NOTIFY_ENDPOINT,
     sessions: process.env.BUGSNAG_SESSIONS_ENDPOINT
-  }
+  },
+  plugins: [bugsnagKoa]
 })
 
-Bugsnag.use(bugsnagKoa)
 
 const middleware = Bugsnag.getPlugin('koa')
 
diff --git a/test/node/features/fixtures/koa/scenarios/app.js b/test/node/features/fixtures/koa/scenarios/app.js
index a82c9f6b6f..2aae3c6bf2 100644
--- a/test/node/features/fixtures/koa/scenarios/app.js
+++ b/test/node/features/fixtures/koa/scenarios/app.js
@@ -7,10 +7,10 @@ Bugsnag.start({
   endpoints: {
     notify: process.env.BUGSNAG_NOTIFY_ENDPOINT,
     sessions: process.env.BUGSNAG_SESSIONS_ENDPOINT
-  }
+  },
+  plugins: [bugsnagKoa]
 })
 
-Bugsnag.use(bugsnagKoa)
 
 const middleware = Bugsnag.getPlugin('koa')
 
diff --git a/test/node/features/fixtures/restify/scenarios/app.js b/test/node/features/fixtures/restify/scenarios/app.js
index 90da6044fe..9b7decf5b5 100644
--- a/test/node/features/fixtures/restify/scenarios/app.js
+++ b/test/node/features/fixtures/restify/scenarios/app.js
@@ -1,5 +1,5 @@
 var Bugsnag = require('@bugsnag/node')
-var bugsnagExpress = require('@bugsnag/plugin-restify')
+var bugsnagRestify = require('@bugsnag/plugin-restify')
 var restify = require('restify')
 var errors = require('restify-errors')
 
@@ -8,11 +8,10 @@ Bugsnag.start({
   endpoints: {
     notify: process.env.BUGSNAG_NOTIFY_ENDPOINT,
     sessions: process.env.BUGSNAG_SESSIONS_ENDPOINT
-  }
+  },
+  plugins: [bugsnagRestify]
 })
 
-Bugsnag.use(bugsnagExpress)
-
 var middleware = Bugsnag.getPlugin('restify')
 
 var server = restify.createServer()