MCP Server
Fastmcp Browser
Lightweight MCP server + WebExtension for AI browser automation: no CDP, your real browser, multi-profile
- Browser Automation
- By rayss868
Features
- network_response_body: "partial" - Firefox only; Chromium returns false. Firefox captures up to 64 KB of text response body per request via webRequest.filterResponseData().
- network_intercept: false / network_modify: false - requests cannot be blocked or modified; the extension is a passive observer.
- screenshot: "bitmap" - PNG raster capture; set fullPage: true to scroll-stitch the entire page into one image.
Use cases
- Replace - rewrite matched text with a placeholder before the AI reads it.
- Remove - drop the element entirely from the agent's view.
- Match by plain substring or regex; scope to all sites or one domain; optional case sensitivity.
- Every text read tool: browser_snapshot, browser_find, browser_inventory, the digest, browser_evaluate, browser_inspect.
- Raw data escapes are not filtered: browser_cookies, browser_storage, browser_download. It filters text the AI reads, not script/file output.
Frequently asked questions
What does Fastmcp Browser do?
Lightweight MCP server + WebExtension for AI browser automation: no CDP, your real browser, multi-profile
Is Fastmcp Browser open source?
Yes — rayss868's source code is publicly available on GitHub, linked above.
What category is Fastmcp Browser in?
Fastmcp Browser is listed under Browser Automation.
Who maintains Fastmcp Browser?
Fastmcp Browser is built and maintained by rayss868.