Grab Context — Firefox extension

Click any element on a web page to copy it as Markdown for AI coding assistants. Detects React, Vue, and Svelte component names and source files.

This is a Firefox build that bundles react-grab (MIT, by Aiden Bai) at version 0.1.29 — the release that ships Vue and Svelte detection alongside React. Markdown conversion is via Turndown. Toolbar icon derived from Phosphor Icons. See NOTICE for full attribution.

What it does

1. Click the toolbar button to enable a selection cursor on the active tab.
2. Click any element. The element is copied to the clipboard as Markdown, with the React / Vue / Svelte component name and source file appended when available.
3. Paste into ChatGPT, Claude, Cursor, Copilot Chat, etc.

Component detection

Framework	Method
React	Walks the fiber tree via bippy, resolves the nearest named component
Vue 3	Reads __vueParentComponent, then type.__name and type.__file (dev builds), plus data-v-inspector from vite-plugin-vue-inspector
Svelte	Reads __svelte_meta

In production builds without dev metadata, copies clean HTML and a CSS selector instead.

Build

pnpm install
pnpm build           # outputs dist/
pnpm package         # outputs grab-context.xpi

Sideload (temporary)

1. about:debugging#/runtime/this-firefox
2. Load Temporary Add-on… → select dist/manifest.json.

Permanent install (signed)

Self-distribution signing via AMO:

pnpm dlx web-ext sign \
  --source-dir=dist \
  --api-key="$AMO_JWT_ISSUER" \
  --api-secret="$AMO_JWT_SECRET" \
  --channel=unlisted

The signed XPI from web-ext-artifacts/ installs permanently in regular Firefox.

Notes

• Targets Firefox 128+ (world: "MAIN" content scripts).
• Background uses background.scripts (event page), not service_worker.
• Uses the chrome.* API (Firefox 109+ aliases), so the upstream content-script source is unchanged.
• Default click action is copy instead of comment, so a single click copies immediately with no prompt.
• Add-on id is grab-context@tomerdanan.dev — change it in src/manifest.json if you republish under a different namespace.

License

MIT — see LICENSE. Bundled dependencies remain under their own MIT licenses; see NOTICE.