How to install Firefox Devtools MCP Moz in Gemini CLI

Gemini CLI was replaced by Antigravity CLI in June 2026. On an enterprise licence or paid API key you can still install Firefox Devtools MCP Moz by running "gemini mcp add firefox-devtools-mcp-moz npx -y @mozilla/firefox-devtools-mcp-moz", then type /mcp to check it.

Built from the published package · server updated 4 days ago

Run the install command

In a terminal, run:

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

2
Check it
Inside Gemini CLI, type /mcp to list servers and tools.

MCP servers run with your permissions. If Firefox Devtools MCP Moz needs an API key, add it under env in the config. Check its README.

Install Firefox Devtools MCP Moz in another app

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Questions

Does Firefox Devtools MCP Moz work in Gemini CLI?

Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and Firefox Devtools MCP Moz installs with the steps above.

Firefox Devtools MCP Moz does not show up in Gemini CLI. What now?

Restart Gemini CLI fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.

Is Firefox Devtools MCP Moz safe?

It scores 79 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.