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v0.4.4

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@github-actions github-actions released this 07 Oct 12:27
· 32 commits to main since this release
v0.4.4
84d9755

WebExtension builds of FastMCP Browser — the MCP bridge that drives Chrome/Firefox over a loopback WebSocket (33 MCP browser tools).

What's new in v0.4.4

  • Actionable diffs. After every action the engine returns a diff of what actually changed on the page, so agents can verify their click or typing landed instead of re-snapshotting blindly.
  • Auto post-action snapshot. Actions now ship a refreshed snapshot (with new refs) in the same call — no extra browser_snapshot round-trip needed.
  • Goal ranking. browser_snapshot / browser_inventory accept a goal (and relevantOnly) so candidates are ranked by relevance and limit cuts from the most relevant end instead of DOM order — long pages no longer hide the target form at the bottom.
  • browser_find tool. Text or regex lookup that returns only the matching elements with refs, without the full tree. 33 MCP tools now.
  • Ref recovery fixes. Radio fill on Google Forms, null unwrap in browser_evaluate, and ref recovery by duplicate index.
  • Housekeeping — MCP server version bumped to 0.4.4; README extension test count corrected (144).

Install

Unzip an archive and load it unpacked:

  • Chromium (fastmcp-browser-extension-chromium.zip) → chrome://extensions → Load unpacked → the chromium folder
  • Firefox (fastmcp-browser-extension-firefox.zip) → about:debugging → Load Temporary Add-on → firefox/manifest.json

The Firefox .xpi has manifest.json at the archive root. It is unsigned; standard Firefox release builds require a Mozilla-signed add-on for permanent installation. LibreWolf and Firefox Developer Edition/Nightly may allow unsigned add-ons when signature enforcement is disabled.

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