Browser MCP

About

Browser MCP is an MCP server + Chrome extension that allows you to automate your browser using AI applications like VS Code, Claude, Cursor, and Windsurf.

Related MCP server: byob

Features

• ⚡ Fast: Automation happens locally on your machine, resulting in better performance without network latency.

• 🔒 Private: Since automation happens locally, your browser activity stays on your device and isn't sent to remote servers.

• 👤 Logged In: Uses your existing browser profile, keeping you logged into all your services.

• 🥷🏼 Stealth: Avoids basic bot detection and CAPTCHAs by using your real browser fingerprint.

Running as an MCP server

This repo builds and runs standalone. The internal monorepo packages the upstream code depends on (@repo/* and @r2r/messaging) are reconstructed under vendor/ and wired up through tsconfig.json path aliases, so no private workspace packages are required.

npm install      # installs deps and builds dist/ via the prepare hook
npm run build    # (re)build dist/index.js
node dist/index.js

The server communicates over stdio using the Model Context Protocol and opens a WebSocket server on port 9009 that the Browser MCP Chrome extension connects to. To use it with an MCP client, register the built binary — for example:

{
  "mcpServers": {
    "browsermcp": {
      "command": "node",
      "args": ["/absolute/path/to/dist/index.js"]
    }
  }
}

After installing the Browser MCP Chrome extension, click its icon and press Connect on the tab you want to automate.

Contributing

This repo contains all the core MCP code for Browser MCP. It was originally developed inside a monorepo and depended on shared utils and types packages; those have been vendored (see vendor/) so the project can be built and run on its own.

Credits

Browser MCP was adapted from the Playwright MCP server in order to automate the user's browser rather than creating new browser instances. This allows using the user's existing browser profile to use logged-in sessions and avoid bot detection mechanisms that commonly block automated browser use.