Firefox DevTools MCP Server: Install & Setup

Install Firefox DevTools in Claude Code

Claude Code

claude mcp add mozilla-firefox-devtools -- npx -y @mozilla/firefox-devtools-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

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

Frequently asked questions

What does the Firefox DevTools MCP server do?

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

Is the Firefox DevTools MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Firefox DevTools run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Firefox DevTools to Claude Code?

Run: claude mcp add mozilla-firefox-devtools -- npx -y @mozilla/firefox-devtools-mcp

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