Is Firefox DevTools MCP Moz safe and trustworthy?

tashan scores Firefox DevTools MCP Moz on public evidence — tashan score 72.0/100, it is currently active, no known advisories against the current release, its declared dependencies reach: browser. Audit scope: OSV advisories, install-time scripts, build provenance and declared permission surface. We do not review source code or execute the capability.

How do I install Firefox DevTools MCP Moz?

In Claude Code: run `claude mcp add mozilla-firefox-devtools-mcp-moz -- npx -y @mozilla/firefox-devtools-mcp-moz`. In Cursor / Claude Desktop, add it to mcp.json / claude_desktop_config.json.

Who maintains Firefox DevTools MCP Moz?

source: mozilla/firefox-devtools-mcp.

‹ The Index

Firefox DevTools MCP Moz

npm

Model Context Protocol (MCP) server for Firefox DevTools automation (moz build with privileged context support)

Works with: Claude Code, Cursor, Claude Desktop, Codex CLI, Gemini CLI, Cline, Windsurf, VS Code (installable)
installable: each client documents how to load an MCP server of this type — that is the client's promise, not a claim verified against this capability

Category: Dev Tools & CI — see all ranked ›

Work: Browser automation

Who it is for: Software engineer · Operations

Install (Claude Code):

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

tashan score: 72.0
Adoption: 771/wk
Upkeep: 93.0
Freshness: 99.0
Evidence coverage: 100% of the inputs this score can use
Health: active
License: MIT OR Apache-2.0

Security audit

Every finding is shown in full — which advisory, the version that fixes it, and the exact command run at install time. Nothing in this audit is behind a licence.

No known advisoriesclearchecked against OSV for 0.10.0 — this package, not its dependency tree

Drives a browserfrom declared dependencies

Can carry remote content into your agentit can pull third-party text into the model's context — treat what it returns as untrusted input

Signed build provenancepublished from public CI with an attestation

What changed recently

2026-08-10 @mozilla/firefox-devtools-mcp-moz now reaches browser Its declared dependencies reach further into your machine than they did before.
2026-08-20 @mozilla/firefox-devtools-mcp-moz published 0.10.0, was 0.9.15 A new release is available.

You are reading this because you came looking. tashan Pro gives tashan doctor the history behind it, so a run over your own config says which of YOURS moved.

You searched for one. Check the rest of your stack:

npx tashan-cli doctor

Reads the config already on your machine and names what is dead, deprecated or running code at install time. No account, nothing uploaded.

tashan Pro$6/mo

We recorded 2 changes to Firefox DevTools MCP Moz in the last 45 days. Pro tells you on the day — for the servers in your own config, not the ones you thought to look up.

Every score since we started measuring, for any capability
The named replacement when something you run is dying — not just that it is
tashan doctor over the config you already have, on your machine

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npm ↗ · source ↗ · pkg:@mozilla/firefox-devtools-mcp-moz

Already running this? Check your whole config — free, in your browser, nothing installed. Or npx tashan-cli doctor locally, which sends nothing at all.

Measured 2026-08-20 · scorer s5 · how · something wrong here?