diff --git a/apps/files/src/mixins/fileActions.js b/apps/files/src/mixins/fileActions.js
index be36240ca4d..5b058a928ef 100644
--- a/apps/files/src/mixins/fileActions.js
+++ b/apps/files/src/mixins/fileActions.js
@@ -68,7 +68,12 @@ export default {
 
     $_fileActions_openEditor(editor, filePath, fileId) {
       if (editor.handler) {
-        return editor.handler(this.configuration, filePath, fileId)
+        return editor.handler({
+          config: this.configuration,
+          extensionConfig: editor.config,
+          filePath,
+          fileId
+        })
       }
 
       // TODO: Refactor in the store
diff --git a/changelog/unreleased/editor-handler b/changelog/unreleased/editor-handler
new file mode 100644
index 00000000000..0396f772d6e
--- /dev/null
+++ b/changelog/unreleased/editor-handler
@@ -0,0 +1,5 @@
+Change: Load extensions config
+
+We've started loading the config of extensions which can now be defined as an object in the `external_apps` in the config.json.
+
+https://github.com/owncloud/phoenix/pull/4380
diff --git a/src/phoenix.js b/src/phoenix.js
index 0871f12ee6d..3b5592c6ed8 100644
--- a/src/phoenix.js
+++ b/src/phoenix.js
@@ -149,9 +149,6 @@ async function loadApps () {
     }
 
     store.dispatch('registerApp', app.appInfo)
-    if (config.external_apps) {
-      store.dispatch('loadExternalAppConfig', { app: app.appInfo, config })
-    }
   }
   router.addRoutes(routes.flat())
   sync(store, router)
diff --git a/src/store/apps.js b/src/store/apps.js
index 83b9118fde6..758b9e5bd8c 100644
--- a/src/store/apps.js
+++ b/src/store/apps.js
@@ -1,5 +1,3 @@
-const merge = require('deepmerge')
-
 const state = {
   file: {
     path: '',
@@ -42,34 +40,6 @@ const actions = {
   },
   addFileAction({ commit }, action) {
     commit('ADD_FILE_ACTION', action)
-  },
-
-  /**
-   * Load config for external app
-   * @param {Object} app      AppInfo containing information about app and local config
-   * @param {Object} config   Config from config.json which can overwrite local config from AppInfo
-   */
-  loadExternalAppConfig({ dispatch }, { app, config }) {
-    config.external_apps.forEach(extension => {
-      // Check if app is loaded from external server
-      // Extension id = id from external apps array
-      // App id = id specified in AppInfo
-      if (extension.id === app.id && (app.config || extension.config)) {
-        if (app.config && extension.config) {
-          dispatch(`${app.name}/loadConfig`, merge(app.config, extension.config), { root: true })
-          return
-        }
-
-        if (app.config) {
-          dispatch(`${app.name}/loadConfig`, app.config, { root: true })
-          return
-        }
-
-        if (extension.config) {
-          dispatch(`${app.name}/loadConfig`, extension.config, { root: true })
-        }
-      }
-    })
   }
 }
 
@@ -125,6 +95,18 @@ const mutations = {
   },
   FETCH_FILE(state, filePath) {
     state.file.path = filePath
+  },
+
+  LOAD_EXTENSION_CONFIG(state, { id, config }) {
+    const editors = state.fileEditors
+
+    for (const editor of editors) {
+      if (editor.app === id) {
+        editor.config = config
+      }
+    }
+
+    state.fileEditors = editors
   }
 }
 
diff --git a/src/store/config.js b/src/store/config.js
index 167c6870603..5ac8f48e1d9 100644
--- a/src/store/config.js
+++ b/src/store/config.js
@@ -41,8 +41,20 @@ const state = {
 }
 
 const actions = {
-  loadConfig(context, config) {
-    context.commit('LOAD_CONFIG', config)
+  loadConfig({ commit }, config) {
+    commit('LOAD_CONFIG', config)
+
+    if (config.external_apps) {
+      config.external_apps.forEach(externalApp => {
+        if (externalApp.config !== undefined) {
+          commit(
+            'LOAD_EXTENSION_CONFIG',
+            { id: externalApp.id, config: externalApp.config },
+            { root: true }
+          )
+        }
+      })
+    }
   },
   loadTheme(context, { theme, name }) {
     theme.name = name