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DimensionFirefox DevTools MCPAutomate Firefox for AI assistants.Chrome DevTools MCPThe Chrome team's official MCP server exposing Chrome DevTools capabilities to AI assistants
FMRS58 / 100 · C76 / 100 · B
Reliability10 / 2013 / 20
Security and permissions8 / 2012 / 20
Maintenance13 / 2017 / 20
Documentation14 / 2017 / 20
Setup experience13 / 2017 / 20
Best for
  • Local Firefox automation
  • Web debugging and development workflows
  • Users of Claude Code, Claude Desktop, Cursor, or Cline
  • Frontend developers who want AI-assisted web debugging and performance analysis
  • Scenarios that need browser automation and performance diagnostics in the same tool
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
  • Cases that only need to scrape page text without performance analysis or complex interaction (a lighter scraping tool is a better fit)
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.
  • Requires a local Chrome browser instance to run
  • navigate_page can visit any URL; type_text/fill_form and similar tools can enter arbitrary content into the page
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.
  • Browser automation tools can access and manipulate the content of open pages — use only in a trusted development/test environment
  • performance_start_trace and similar tracing tools continuously record browser activity — avoid leaving them running on pages containing sensitive information
Supported clientsClaude Code, Claude Desktop, Cursor, ClineClaude Code, VS Code, Cursor, Windsurf, JetBrains IDEs, Cline, Amp, Kiro, Antigravity
Tools2822