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Install the extension

Until the store listings land, install from source. Prerequisites: Node 22 (pinned in .tool-versions) and pnpm.

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

Or load a production build unpacked:

Terminal window
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.

The overlay is injected only when you click the toolbar button (no broad host access), so there’s nothing to reload — just open a tab and Start annotating.