diff --git a/README.md b/README.md
index 702254b..910f204 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,10 @@ Example: `npm run watch:firefox-android -- --firefox-apk=org.mozilla.fenix --fir
 
 ## Build
 ```ssh
-$ npm run build
+// For Firefox
+$ npm run build:firefox
+// For Chromium
+$ npm run build:chromium
 ```
 
 ## Release
diff --git a/package.json b/package.json
index 6516b99..9d9b86f 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,8 @@
 	},
 	"scripts": {
 		"copy-browser-polyfill": "cp node_modules/webextension-polyfill/dist/browser-polyfill.js src/browser-polyfill.js",
+		"inject-browser-polyfill": "sed -i -r 's/(<!-- \\[INJECT-BROWSER-POLYFILL] -->).*/\\1<script type=\"module\" src=\"browser-polyfill.js\"><\\/script>/' src/*.html",
+		"uninject-browser-polyfill": "sed -i -r 's/(<!-- \\[INJECT-BROWSER-POLYFILL] -->).+/\\1/' src/*.html",
 		"copy-version": "sed -i 's/^\t\"version\": \".*\",$/\t\"version\": \"'$(rg '^\t\"version\": \"(.+)\",$' -r '$1' < package.json)'\",/' src/manifest.json",
 		"lint": "web-ext lint -w",
 		"test": "echo \"Error: no test specified\" && exit 0",
@@ -17,12 +19,17 @@
 		"watch:firefox-android": "web-ext run -t firefox-android",
 		"watch:chromium": "web-ext run -t chromium",
 		"prebuild": "cp LICENSE.txt src/",
-		"build": "web-ext build",
+		"prebuild:firefox": "npm run prebuild",
+		"prebuild:chromium": "npm run prebuild && npm run inject-browser-polyfill",
+		"build:firefox": "web-ext build -i browser-polyfill.js",
+		"build:chromium": "web-ext build",
 		"postbuild": "rm src/LICENSE.txt",
+		"postbuild:firefox": "npm run postbuild",
+		"postbuild:chromium": "npm run postbuild && npm run uninject-browser-polyfill",
 		"postinstall": "npm run copy-browser-polyfill",
 		"preversion": "npm run lint && npm test",
 		"version": "npm run copy-version && git add -u",
-		"postversion": "npm run build"
+		"postversion": "npm run build:firefox"
 	},
 	"repository": {
 		"type": "git",
diff --git a/src/background.html b/src/background.html
index 9a30290..9adf49c 100644
--- a/src/background.html
+++ b/src/background.html
@@ -3,7 +3,8 @@
 <head>
 	<meta charset="utf-8" />
 	<title>/usr/space</title>
-	<script type="module" src="browser-polyfill.js"></script>
+
+	<!-- [INJECT-BROWSER-POLYFILL] -->
 	<script type="module" src="background.js"></script>
 </head>
 </html>
diff --git a/src/popup.html b/src/popup.html
index 416b77f..ea5203e 100644
--- a/src/popup.html
+++ b/src/popup.html
@@ -88,7 +88,7 @@
 		</details>
 	</section>
 
-	<script type="module" src="browser-polyfill.js"></script>
+	<!-- [INJECT-BROWSER-POLYFILL] -->
 	<script type="module" src="popup.js"></script>
 </body>
 </html>
