Modern MCP server + browser extensions for reliable, multi‑instance automation over a single WebSocket daemon.

• Single WS daemon (8765), many sessions (Claude instances)
• Per‑session tab routing and ownership (no cross‑talk)
• Unified tools across Chrome and Firefox
• Auto‑reconnect (Firefox adds alarms + online hooks)

• Node.js 20+
• Chrome or Firefox
• Claude Code
• Also works with WSL2 and Windows Chrome

git clone https://github.com/david-strejc/browsermcp-enhanced.git
cd browsermcp-enhanced
./scripts/deploy

• Option A: User services (recommended for nvm users, no sudo required):

  ./scripts/systemd-user-install.sh

• Option B: System services (requires sudo):

  sudo ./scripts/systemd-install.sh --user "$USER" \
    --install-dir "/home/$USER/.local/lib/browsermcp-enhanced" \
    --http-port 3000 --ws-port 8765

• Chrome: chrome://extensions → Developer mode → Load unpacked → chrome-extension/
• Firefox: about:debugging#/runtime/this-firefox → Load Temporary Add‑on → firefox-extension/manifest.json

  {
    "mcpServers": {
      "browsermcp": {
        "type": "http",
        "url": "http://127.0.0.1:3000/mcp"
      }
    }
  }

For detailed architecture and troubleshooting information, see ADVANCE_INFO.md

• WebSocket reconnection may require Chrome restart
• Some sites with strict CSP may require unsafe mode
• Safari and Firefox support coming in v2.0.0
• Behind proxy: If you're behind a proxy, set NO_PROXY=localhost,127.0.0.1 to allow local connections

// Navigate to a URL
await browser_navigate({ url: "https://example.com" })

// Snapshot
await snapshot.accessibility({ mode: 'scaffold' })

// Click an element
await browser_click({ ref: "button-1", element: "Submit button" })

// Plain DOM
await js.execute({ code: "return document.title" })

// Safe operation (no code)
await js.execute({ method: 'query', args: ['h3', { attrs: ['textContent'], limit: 10 }] })

// Unsafe (enable in extension options first)
await js.execute({ code: "(function(){ return location.href })()", unsafe: true })

// Multi-step form filling
await browser_multitool({
  intent: "form_fill",
  snapshot: snapshotData,
  fields: {
    "username": "john.doe",
    "email": "[email protected]",
    "message": "Hello world"
  }
})

Daemon: /tmp/browsermcp-daemon.log, /tmp/browsermcp-events.log Chrome: chrome://extensions → Inspect (background) Firefox: about:debugging → Inspect (background)

# Allow all origins (development)
BROWSER_MCP_ALLOWED_ORIGINS="*"

# Specific origins (production)
BROWSER_MCP_ALLOWED_ORIGINS="https://example.com,https://app.example.com"

# Custom WebSocket port
BROWSER_MCP_PORT=8765

• Unsafe mode toggle (required for unsafe: true)

• browser_navigate, browser_go_back, browser_go_forward
• dom.click, dom.type, dom.hover, dom.select
• snapshot.accessibility
• tabs.list, tabs.select, tabs.new, tabs.close
• console.get, screenshot.capture, js.execute

# Run tests
npm test

# Quick test
npm run test:quick

# With coverage
npm run test:coverage

# Watch mode
npm run watch

# Type checking
npm run typecheck

# Inspector
npm run inspector

See CHANGELOG.md for detailed version history.

• 🚀 First production-ready release
• ✅ RPC-based safe mode execution
• ✅ Sandboxed iframe isolation
• ✅ Comprehensive testing suite
• ✅ Full documentation

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

This project is licensed under the MIT License - see the LICENSE file for details.

• Model Context Protocol team for the MCP specification
• Playwright for browser automation inspiration
• Claude and the o3 model for architectural guidance
• All contributors and testers

• WebSocket reconnection may require Chrome restart
• Some sites with strict CSP may require unsafe mode
• Safari and Firefox support coming in v2.0.0

• Issues
• Discussions
• Release Notes

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