Install the extension

Install from your browser’s store — one click, auto-updating:

• Chrome / Chromium: Chrome Web Store
• Firefox: Firefox Add-ons

The overlay is injected only when you click the toolbar button (no broad host access), so just open a tab and Start annotating.

Run from source

Prefer to build it yourself, or want hot reload for development? Prerequisites: Node 22 (pinned in .tool-versions) and pnpm.

pnpm install
pnpm dev            # Chrome, with hot reload
pnpm dev:firefox    # Firefox, with hot reload

Or load a production build unpacked:

pnpm build          # outputs .output/chrome-mv3
pnpm build:firefox  # outputs .output/firefox-mv2

• Chrome: chrome://extensions → enable Developer mode → Load unpacked → select .output/chrome-mv3.
• Firefox: about:debugging#/runtime/this-firefox → Load Temporary Add-on → select .output/firefox-mv2/manifest.json.