diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
new file mode 100644
index 0000000..2783902
--- /dev/null
+++ b/.github/workflows/format.yml
@@ -0,0 +1,24 @@
+name: Node.js CI (format)
+
+on:
+    push:
+        branches: [main]
+    pull_request:
+        branches: [main]
+
+jobs:
+    format:
+        runs-on: ubuntu-latest
+
+        strategy:
+            matrix:
+                node-version: [21.x]
+
+        steps:
+            - uses: actions/checkout@v4
+            - name: Use Node.js ${{ matrix.node-version }}
+              uses: actions/setup-node@v4
+              with:
+                  node-version: ${{ matrix.node-version }}
+            - run: npm ci
+            - run: npm run format:check
diff --git a/.prettierrc.json b/.prettierrc.json
new file mode 100644
index 0000000..974b6c7
--- /dev/null
+++ b/.prettierrc.json
@@ -0,0 +1,5 @@
+{
+    "printWidth": 120,
+    "tabWidth": 4,
+    "trailingComma": "none"
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index b1962c5..eecd570 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "async-query": "^1.0.4",
         "chokidar": "^3.6.0",
         "copy-webpack-plugin": "^12.0.2",
+        "prettier": "^3.2.5",
         "ts-loader": "^9.5.1",
         "ts-node": "^10.9.2",
         "twi-ext": "^0.5.2",
@@ -5300,6 +5301,21 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.2.5",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.2.5.tgz",
+      "integrity": "sha512-3/GWa9aOC0YeD7LUfvOG2NiDyhOWRvt1k+rcKhOuYnMY24iiCphgneUfJDyFXd6rZCAnuLBv6UeAULtrhT/F4A==",
+      "dev": true,
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/process": {
       "version": "0.11.10",
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
diff --git a/package.json b/package.json
index 27b66b9..c6d78d9 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,8 @@
   "scripts": {
     "build": "webpack",
     "watch": "webpack --watch",
+    "format": "prettier --write ./src/**/*",
+    "format:check": "prettier --check ./src/**/*",
     "package": "ts-node ./script/package.ts",
     "version": "npm run build && git add ."
   },
@@ -28,6 +30,7 @@
     "async-query": "^1.0.4",
     "chokidar": "^3.6.0",
     "copy-webpack-plugin": "^12.0.2",
+    "prettier": "^3.2.5",
     "ts-loader": "^9.5.1",
     "ts-node": "^10.9.2",
     "twi-ext": "^0.5.2",
diff --git a/src/image/icon.png b/public/image/icon.png
similarity index 100%
rename from src/image/icon.png
rename to public/image/icon.png
diff --git a/src/manifest/v2.json b/src/manifest/v2.json
index 8bce1fa..8dad2f7 100644
--- a/src/manifest/v2.json
+++ b/src/manifest/v2.json
@@ -9,17 +9,9 @@
     },
     "content_scripts": [
         {
-            "matches": [
-                "https://twitter.com/*",
-                "https://mobile.twitter.com/*",
-                "https://pro.twitter.com/*"
-            ],
-            "js": [
-                "js/loader.js"
-            ]
+            "matches": ["https://twitter.com/*", "https://mobile.twitter.com/*", "https://pro.twitter.com/*"],
+            "js": ["js/loader.js"]
         }
     ],
-    "web_accessible_resources": [
-        "js/main.js"
-    ]
-}
\ No newline at end of file
+    "web_accessible_resources": ["js/main.js"]
+}
diff --git a/src/manifest/v3.json b/src/manifest/v3.json
index ea13047..4fa32a1 100644
--- a/src/manifest/v3.json
+++ b/src/manifest/v3.json
@@ -7,33 +7,17 @@
     "icons": {
         "128": "image/icon.png"
     },
-    "host_permissions": [
-        "https://twitter.com/*",
-        "https://mobile.twitter.com/*",
-        "https://pro.twitter.com/*"
-    ],
+    "host_permissions": ["https://twitter.com/*", "https://mobile.twitter.com/*", "https://pro.twitter.com/*"],
     "content_scripts": [
         {
-            "matches": [
-                "https://twitter.com/*",
-                "https://mobile.twitter.com/*",
-                "https://pro.twitter.com/*"
-            ],
-            "js": [
-                "js/loader.js"
-            ]
+            "matches": ["https://twitter.com/*", "https://mobile.twitter.com/*", "https://pro.twitter.com/*"],
+            "js": ["js/loader.js"]
         }
     ],
     "web_accessible_resources": [
         {
-            "resources": [
-                "js/main.js"
-            ],
-            "matches": [
-                "https://twitter.com/*",
-                "https://mobile.twitter.com/*",
-                "https://pro.twitter.com/*"
-            ]
+            "resources": ["js/main.js"],
+            "matches": ["https://twitter.com/*", "https://mobile.twitter.com/*", "https://pro.twitter.com/*"]
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/webpack.config.js b/webpack.config.js
index 661c6b1..3fde6c5 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -68,14 +68,14 @@ module.exports = {
         new CopyFilePlugin({
             patterns: [
                 {
-                    context: "./src/image/",
+                    context: "./public/",
                     from: "**/*",
-                    to: "chrome/image/"
+                    to: "chrome/"
                 },
                 {
-                    context: "./src/image/",
+                    context: "./public/",
                     from: "**/*",
-                    to: "firefox/image/"
+                    to: "firefox/"
                 },
                 {
                     from: "./*LICENSE",