Main-world Content Script

Injects a small UI into every web page from both the extension and the page's own JavaScript world.

Runs on Chrome, Edge, Firefox · Manifest V3 · Surfaces: content script, background service worker · Styling: CSS · Level: intermediate

Create this project

npx extension@latest create my-content-main-world --template content-main-world
cd my-content-main-world
npm install
npm run dev

Files in this template

  • extension.config.js
  • src/background.js
  • src/content/isolated-one.js
  • src/content/isolated-two.js
  • src/content/scripts.js
  • src/content/styles.css
  • src/content/utils/constants.js
  • src/content/utils/create-badge.js
  • src/images/icon.png
  • src/manifest.json

Source on GitHubDocumentation

extension.devDocumentation for extension.dev