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/().*/\\1
+
+