Firefox Devtools MCP Moz

Name: Firefox Devtools MCP Moz
Author: mozilla

Verified · npm:@mozilla

MCP server by mozilla · updated 4 days ago · ★ 506 · 1.3k downloads a week

Score 79

Model Context Protocol (MCP) server that lets AI agents browse the web and debug web pages with Firefox (moz build with privileged context support) Firefox Devtools MCP Moz is published by npm:@mozilla from its verified domain in the official MCP Registry.

Install Add to Cursor Add to VS Code GitHub Website

Works withClaude Code Claude Desktop Cursor Codex Gemini CLI VS Code Windsurf Antigravity CLI

Maintenance

Last commit 4 days ago

Licence

No licence found, so reuse rights are unclear

Quality

Clear description, published package or server URL, 506 stars, original repository

Security

Not checked yet. What we check

Install Firefox Devtools MCP Moz

Built from the published package, never by AI

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

Run in your terminal. Add --scope user to use it in every project.

Step-by-step: install Firefox Devtools MCP Moz in Claude Code

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

Settings, Developer, Edit config. Paste into claude_desktop_config.json and restart.

Step-by-step: install Firefox Devtools MCP Moz in Claude Desktop

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

Add to ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (this project).

Step-by-step: install Firefox Devtools MCP Moz in Cursor

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

Add to .vscode/mcp.json. VS Code uses "servers", not "mcpServers".

Step-by-step: install Firefox Devtools MCP Moz in VS Code

codex mcp add firefox-devtools-mcp-moz -- npx -y @mozilla/firefox-devtools-mcp-moz

Step-by-step: install Firefox Devtools MCP Moz in Codex

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

Add to ~/.gemini/config/mcp_config.json (all projects) or .agents/mcp_config.json (this project).

Step-by-step: install Firefox Devtools MCP Moz in Antigravity CLI

gemini mcp add firefox-devtools-mcp-moz npx -y @mozilla/firefox-devtools-mcp-moz

Gemini CLI was replaced by Antigravity CLI in June 2026 and remains only for enterprise licences and paid API keys.

Step-by-step: install Firefox Devtools MCP Moz in Gemini CLI

MCP servers run with your permissions and can read what you give them access to. Some need an API key: check the README and add it under env in the firefox-devtools-mcp-moz block.

Firefox Devtools MCP Moz: common questions

How do I install Firefox Devtools MCP Moz?

In Claude Code run claude mcp add firefox-devtools-mcp-moz -- npx -y @mozilla/firefox-devtools-mcp-moz. For Claude Desktop, Cursor and VS Code, paste the config shown above and restart. See the install guides.

Is Firefox Devtools MCP Moz the official server?

Firefox Devtools MCP Moz is published by npm:@mozilla from its verified domain in the official MCP Registry.

Is Firefox Devtools MCP Moz free?

The code is published under the NOASSERTION licence. The service it connects to may have its own pricing.

Is Firefox Devtools MCP Moz safe to use?

It scores 79 of 100. Grades: maintenance A, licence F, quality A. The security check has not run for it yet. Review the code before you install. How grades work.

Does Firefox Devtools MCP Moz work with ChatGPT?

Not directly. It runs locally, and ChatGPT only connects to remote servers with a URL. Use it in Claude Code, Claude Desktop, Cursor, VS Code or Codex.