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Firefox DevTools MCP

io.github.mozilla/firefox-devtools-mcp · version 0.10.7

Community listing. Not installed or verified by cosmic-mcp. Read the source and its permissions before you run it.

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

https://github.com/mozilla/firefox-devtools-mcp

Quick facts

  • Listing: Community
  • Published Oct 28, 11:28 UTC
  • Transport: stdio
  • Package: npm @mozilla/firefox-devtools-mcp 0.10.7
  • Listed by cosmic-mcp: Nov 8, 19:00 UTC

Developer tools

Setup snippets

Generated from the registry entry. cosmic-mcp has not run or reviewed this server; values in angle brackets are yours to fill in.

Run it locally (npm)

npx -y '@mozilla/[email protected]'

Claude Desktop (claude_desktop_config.json)

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

Claude Code

claude mcp add 'firefox-devtools-mcp' -- npx -y '@mozilla/[email protected]'

Cursor (.cursor/mcp.json)

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

VS Code (.vscode/mcp.json)

{
  "servers": {
    "firefox-devtools-mcp": {
      "args": [
        "-y",
        "@mozilla/[email protected]"
      ],
      "command": "npx",
      "env": {
        "FIREFOX_HEADLESS": "<your firefox headless>",
        "START_URL": "<your start url>"
      },
      "type": "stdio"
    }
  }
}

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