foxhand: open-source Firefox MCP server drives your real logged-in profile with 45 tools
Weird_East_5978 · reddit · 2026-10-29
- Developer released foxhand, an open-source Firefox MCP server that drives your real logged-in browser profile instead of a blank session — filling a gap left by Chrome-only alternatives.
- Since Firefox's CDP support is thin, it's built as a WebExtension plus a native messaging host: the add-on starts a helper serving Streamable HTTP on localhost:8901 with bearer-token auth.
- Ships 45 tools: tabs/windows, accessibility snapshots with refs, click/type/fill/scroll/wait, screenshots, bookmarks, history, downloads, sessions, cookies.
- Hard-won details include stateless HTTP so clients holding GET streams aren't dropped, cancellation that actually interrupts in-page waits, and a WSL mode.
- MPL-2.0, listed on Firefox Add-ons; author warns prompt injection is real — pages can try to steer the agent.
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