Echo Chrome Extension

Minimal MV3 React content UI injected via background service worker.

Structure

• src/background/background.ts: MV3 service worker, injects content script and CSS
• src/content/content.tsx: content script mounting a React widget
• src/components/ChatWidget.tsx: simple chat UI
• src/styles/*.css: styles
• public/manifest.json: extension manifest

Development

1. Install deps
   • npm install
2. Build
   • npm run build
3. Load in Chrome
   • Open chrome://extensions
   • Enable Developer mode
   • Load unpacked -> select dist