This is a starter kit for building cross platform browser extensions. You can use it as a template for your project. It comes with a Vite + TailwindCSS + WebdriverIO setup for building and testing extension popup modals, content and background scripts. Read more about building cross platform browser extensions in our corresponding blog post.

A browser web extension that works on Chrome, Firefox and Safari. Download the extension on the marketplaces:

• Chrome:: https://chrome.google.com/webstore/detail/my-web-extension/lnihnbkolojkaehnkdmpliededkfebkk
• Firefox: https://addons.mozilla.org/en-GB/firefox/addon/my-web-extension/
• Safari: (not yet supported, see stateful/web-extension-starter-kit#1)

Install dependencies via:

npm install

then start a browser with the web extension installed:

# run Chrome
npm run start:chrome

or

# run Firefox
npm run start:firefox

This will build the extension and start a browser with it being loaded in it. After making changes, Vite automatically will re-compile the files and you can reload the extension to apply them in the browser.

Bundle the extension by running:

npm run build

This script will bundle the extension as web-extension-chrome-vX.X.X.crx and web-extension-firefox-vX.X.X.zip. The generated files are in dist/. You can also grab a version from the latest test run on the main branch.

To load the extension in Firefox go to about:debugging#/runtime/this-firefox or Firefox > Preferences > Extensions & Themes > Debug Add-ons > Load Temporary Add-on.... Here locate the dist/ directory and open manifestv2.json

To load the extensions in Google Chrome go to chrome://extensions/ and click Load unpacked. Locate the dist directory and select manifest.json.

This project tests the extension files using component tests and the extension integration via e2e test with WebdriverIO.

Run unit/component tests:

npm run test:component

Run e2e tests:

npm run test:e2e

• content-script - UI files
• background.ts - Background script/Service worker
• index.html - popup UI

If you have any questions feel free to open an issue.