Firefox DevTools MCP

local MCP server

Installation

Terminal

claude mcp add firefox-devtools-mcp -e FIREFOX_HEADLESS=... -e START_URL=... -- npx -y @mozilla/firefox-devtools-mcp

Run in your project folder. Add --scope user to use it everywhere.

Claude Desktop, Cursor & other clients

Add to claude_desktop_config.json or .cursor/mcp.json.

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

Fill in the environment variables with your own credentials.

Summary

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

Questions

Firefox DevTools MCP is a local MCP server distributed as the npm package @mozilla/firefox-devtools-mcp.

Run: claude mcp add firefox-devtools-mcp -e FIREFOX_HEADLESS=... -e START_URL=... -- npx -y @mozilla/firefox-devtools-mcp

Run: codex mcp add firefox-devtools-mcp --env FIREFOX_HEADLESS=... --env START_URL=... -- npx -y @mozilla/firefox-devtools-mcp

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