freema/firefox-devtools-mcp

Overview

A Model Context Protocol server that connects AI assistants to Firefox's Remote Debugging Protocol. It allows tools to inspect page elements, monitor network activity, and execute JavaScript in the browser.

Best for

Best for
Developers building AI-assisted debugging workflows for Firefox

Use cases

• Automate browser debugging tasks via AI assistants
• Inspect live DOM and network requests programmatically
• Execute JavaScript in Firefox from an MCP client

How to use

Install

npx @mozilla/firefox-devtools-mcp@latest

Tools exposed

• list_pages
• select_page
• navigate_page
• take_snapshot
• click_by_uid
• fill_by_uid
• list_network_requests
• get_network_request
• screenshot_page
• list_console_messages
• evaluate_script
• list_scripts
• inspect_source
• set_logpoints
• list_privileged_contexts
• select_privileged_contexts
• evaluate_privileged_scripts
• get_firefox_prefs
• set_firefox_prefs
• list_extensions

Tested with

Claude Code, Claude Desktop, Cursor, Cline

Example client config

{\n  "mcpServers": {\n    "firefox-devtools": {\n      "command": "npx",\n      "args": ["-y", "@mozilla/firefox-devtools-mcp@latest", "--headless", "--viewport", "1280x720"],\n      "env": {\n        "START_URL": "about:blank"\n      }\n    }\n  }\n}

Notes

A Model Context Protocol server that connects AI assistants to Firefox’s Remote Debugging Protocol. It allows tools to inspect page elements, monitor network activity, and execute JavaScript in the browser.

192 stars on GitHub. Last updated 2026-05-28.

Use cases

• Automate browser debugging tasks via AI assistants
• Inspect live DOM and network requests programmatically
• Execute JavaScript in Firefox from an MCP client

Pros

• Leverages Firefox’s native debugging protocol for reliable control
• Written in TypeScript with 192 GitHub stars, indicating community interest
• Enables AI-driven browser automation without Selenium or Playwright

Cons

• Requires Firefox with remote debugging enabled, adding setup overhead
• Limited to Firefox; no cross-browser support
• Depends on MCP client compatibility, which is still emerging

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.