Firefox DevTools MCP

Package (npm 0.10.4)

npx -y @mozilla/[email protected]

Or add to your MCP client config:

{
  "mcpServers": {
    "firefox-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/[email protected]"
      ],
      "env": {
        "FIREFOX_HEADLESS": "<YOUR_VALUE>",
        "START_URL": "<YOUR_VALUE>"
      }
    }
  }
}

• FIREFOX_HEADLESS — Set to true to run Firefox without a visible window.
• START_URL — URL to open when the server starts.

This server takes extra arguments — see its repository.