Firefox DevTools MCP
Control and debug Firefox: navigate, fill forms, inspect network and console, profile.
MCP server · by mozilla
About
Firefox DevTools MCP is an MCP server published by mozilla. Marketplaces we read that list it: 1 (Official MCP Registry). The last change we recorded was on 2026-10-12. As of our marketplace pass on 2026-10-13.
What it asks for
- Runs on your machine
- Settings: 2
What it declares, asks for and runs, in full
Only install plugins from developers you trust. We list what marketplaces publish and do not test plugins.
Package
npm @mozilla/firefox-devtools-mcp (@mozilla/firefox-devtools-mcp on npm)
- npm downloads/week: 4 248 (2026-10-12)
- npm downloads/month: 15 837 (2026-10-12)
- Latest version on npm: 0.10.5, published 2026-10-09
- Declared version 0.10.5 is not listed on npm
npm facts come from the public npm registry (registry.npmjs.org, api.npmjs.org). Each figure is the registry's own and is never added to another. A registry that publishes no figure shows none: no number is not zero.
Works with
- Claude Code
- Codex
- Cursor
- VS Code
- Copilot CLI
A one-click link opens the client, which asks you to confirm before it adds the server.
From the marketplaces that list it and the MCP transport it declares, as each client documents them. We do not test plugins.
Connect
Commands and configs built only from what its marketplaces declare. We do not run them for you and do not test plugins.
As a local MCP server: npm package
Built from what Official MCP Registry declares.
claude mcp add --transport stdio firefox-devtools-mcp -- npx -y @mozilla/firefox-devtools-mcp --tool-preset developer[mcp_servers.firefox-devtools-mcp]
command = "npx"
args = ["-y", "@mozilla/firefox-devtools-mcp", "--tool-preset", "developer"]{
"mcpServers": {
"firefox-devtools-mcp": {
"command": "npx",
"args": [
"-y",
"@mozilla/firefox-devtools-mcp",
"--tool-preset",
"developer"
]
}
}
}Optional settings it also lists: FIREFOX_HEADLESS, START_URL.
Where it is published
| Marketplace | Status | Version | Figures | Verified | First seen |
|---|---|---|---|---|---|
| Official MCP Registry (Open the registry record) | Listed | 0.10.5 | Downloads/month (npm): 15 837 Downloads/week (npm): 4 248 Forks (GitHub): 66 Stars (GitHub): 483 |
Not marked |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
What changed
Nothing has moved on this plugin since we started watching it.
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Found by meaning, not by shared code or a shared repository: similar plugins stay separate products, and this is not a review or a recommendation.
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Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.