Firefox DevTools MCP: MCP server, setup and security

What Firefox DevTools MCP does

According to its repository: “Control and debug Firefox: navigate, fill forms, inspect network and console, profile.”

An MCP server gives an AI agent extra tools it calls during the conversation: the agent reads their description, decides to use them and gets the result back. Firefox DevTools MCP is listed under Developer tools, a category of 475 servers in the directory, where it ranks #61 by stars.

Topics declared by the repository: claude-code, firefox.

Installing and connecting Firefox DevTools MCP

Distribution modes declared in the official MCP registry:

• npm package (Node.js, usually started with npx)

Like any MCP server, you declare it in your client's configuration (Claude Desktop, Claude Code, Cursor, VS Code, Codex…): a name, the command that starts it or its URL, and any environment variables. The client then starts it and lists its tools. Project language: TypeScript.

Security: what to check

An MCP server runs code with the rights you give it, and the model reads its tool descriptions: a malicious or compromised server can hijack the agent. Read the code, or pick a maintained and widely used server, before connecting it.

Points found for Firefox DevTools MCP:

• No licence: without a licence the code is not legally reusable, even if it is public. Avoid it in a company setting without the author's agreement.

Good practice: grant only the rights needed (least privilege), require human approval for irreversible actions, and run the AI agent security check.

Project activity and maintenance

Created on October 8, 2025, the mozilla/firefox-devtools-mcp repository has 519 stars and 72 forks, with 0 open issues. It has more stars than 88% of the servers in the directory. It received changes this month. Version published in the registry: 0.10.6 (October 16, 2026).

Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.