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DimensionFirefox DevTools MCPAutomate Firefox for AI assistants.Playwright MCP ServerPlaywright-based browser automation MCP server
FMRS58 / 100 · C66 / 100 · C
Reliability10 / 209 / 20
Security and permissions8 / 2011 / 20
Maintenance13 / 2015 / 20
Documentation14 / 2017 / 20
Setup experience13 / 2014 / 20
Best for
  • Local Firefox automation
  • Web debugging and development workflows
  • Users of Claude Code, Claude Desktop, Cursor, or Cline
  • Developers who need browser automation from Claude Desktop, VS Code, and similar clients
  • Users doing web testing and scraping
Not for
  • Environments without a local Firefox installation
  • Situations where an agent must not access browser-reachable content
  • Cloud-hosted execution environments
  • Direct use with a normal daily-browsing profile
  • Environments requiring strict sandboxing that disallow AI-controlled browsers
  • Claude Desktop users needing HTTP/SSE mode (Claude Desktop currently requires stdio mode)
Required permissions
  • Requires access to a local Firefox browser and sites it can reach.
  • A dedicated Firefox profile is recommended; when connecting to an existing browser, the agent can access cookies, logged-in sessions, and open tabs.
  • The `prefs` and `privileged` modules require `MOZ_REMOTE_ALLOW_SYSTEM_ACCESS=1` and are available only in the Mozilla-internal build.
  • Firefox for Android mode requires adb on PATH and a connected Android device.
  • Runs real browsers (Chromium, Firefox, WebKit) locally
  • Automatically downloads and installs browser binaries on first use
  • Writes log files to ~/playwright-mcp-server.log
  • Binds a local port in HTTP mode (default 8931)
Risks and side effects
  • Browser automation servers carry inherent risk and may expose cookies, saved sessions, and browser-reachable content.
  • Web pages may contain prompt injection intended to manipulate the agent; use sites you control or trust.
  • The developer preset enables script and debugging tools, while the mozilla preset additionally expands access to privileged contexts.
  • Connecting to an existing Firefox uses a real browsing session; leaving Marionette enabled during normal browsing can expose navigator.webdriver and trigger bot detection.
  • AI can execute JavaScript in a real browser, potentially accessing and manipulating sensitive web content
  • Automatic browser downloads consume disk space and bandwidth
  • HTTP mode binds to localhost only; exposing it via SSH tunnels still requires caution
Supported clientsClaude Code, Claude Desktop, Cursor, ClineClaude Desktop, Claude Code, Cline, Cursor, VS Code
Tools281