firefox-devtools-mcp

firefox-devtools-mcp is an MCP server by mozilla. Model Context Protocol server for Firefox DevTools - enables AI assistants to inspect and control Firefox browser through WebDriver BiDi. It has 519 GitHub stars and ranks #51 of 591 in Browser Automation by stars.

Category: Browser Automation
Author: mozilla
GitHub stars: 519
This week: Tracking since 18 Oct 2026
Weekly downloads: 5,089
Language: TypeScript
License: Other
Last update: 2026-10-23 (yesterday)
Links: Source npm

claude-code
firefox
mcp
mcp-server

How to install firefox-devtools-mcp

firefox-devtools-mcp is published on npm as @mozilla/firefox-devtools-mcp, and it is listed in the official MCP Registry. These steps assume it runs as a local stdio server, which is the usual setup.

Check the README. Confirm the start command and note any API keys or environment variables it needs (pass them with -e KEY=value or an env block). You need Node.js for npx.

Add it to Claude Code from a terminal:

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

Or add it to Cursor or Claude Desktop in .cursor/mcp.json or claude_desktop_config.json:

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

Restart the client and check it. Run claude mcp list, or open the client's MCP settings, and confirm firefox-devtools-mcp and its tools are listed. The install guide covers VS Code and Codex.

Also listed in

MCP servers for Claude Code2591

Maintain this project? Get it featured ($99/mo, pinned at the top of Browser Automation) or see what featuring includes.

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Frequently asked questions

What is firefox-devtools-mcp?

firefox-devtools-mcp is an MCP server by mozilla in the Browser Automation category. Model Context Protocol server for Firefox DevTools - enables AI assistants to inspect and control Firefox browser through WebDriver BiDi. It has 519 GitHub stars and ranks #51 of 591 in Browser Automation by stars. It is written in TypeScript. It is licensed under Other. It was last updated yesterday.

Is firefox-devtools-mcp free and open source?

firefox-devtools-mcp lists its license as Other. Read the license text in the repository before using it in a commercial product, and check whether the service it connects to charges for API access.

What are the alternatives to firefox-devtools-mcp?

Other Browser Automation projects on MCP Harbor include browser-use, chrome-devtools-mcp, payload. Each alternative links to its own page with stars, license and recent activity. The Browser Automation category ranks all 591 by stars, and you can re-sort it by growth this week.

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Data last updated 25 October 2026. Stars and downloads are refreshed every day from GitHub and npm.