Firefox DevTools MCP server

Control and debug Firefox: navigate, fill forms, inspect network and console, profile.

Developer tools ★ 470 GitHub starsv0.10.4Updated Sep 22, 2026

Install

npm (stdio)npx -y @mozilla/firefox-devtools-mcp

JSON for apps that use an mcpServers block (Claude Desktop, Cursor and others):

{"mcpServers": {
  "firefox-devtools-mcp": {
    "command": "npx",
    "args": ["-y", "@mozilla/firefox-devtools-mcp"]
  }
}}

From the server's registry entry. Many servers also need an API key or other settings: check the repository's README before you run it.

About this server

Registry name	`io.github.mozilla/firefox-devtools-mcp`
Repository	github.com/mozilla/firefox-devtools-mcp
Website	github.com/mozilla/firefox-devtools-mcp
Packages	npm `@mozilla/firefox-devtools-mcp`
In the registry since	Sep 22, 2026
GitHub stars	470

Listed from the official MCP Registry. We have not reviewed or tested this server; a local server runs code on your machine, so read the repository first.

Use it with

AI agents whose docs say they support MCP.

OpenAI Codex Claude Code LangChain Pi OpenCode Cursor GitHub Copilot LangGraph AI SDK Strands Agents Lovable Replit Agent

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