JavaScript-based extension with a sidebar panel.

Starter extension with a sidebar panel. Includes dev, build, and preview scripts.

npx extension@latest create <project-name> --template javascript
cd <project-name>
npm install

Run the extension in development mode.

npm run dev

Build the extension for production.

npm run build

Preview the extension in the browser.

npm run preview

Chromium is the default. You can explicitly target Chrome, Edge, or Firefox:

# Chromium (default)
npm run dev

# Chrome
npm run dev -- --browser=chrome

# Edge
npm run dev -- --browser=edge

# Firefox
npm run dev -- --browser=firefox

Learn more in the Extension.js docs.