SERVER

Firefox DevTools MCP

Rank #609

io.github.mozilla/firefox-devtools-mcp

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

4 versions

553 GitHub stars

by mozilla (1 servers)View repository ↗

First listed

Oct 19, 2025

Last publish date

Oct 28, 2026

PURPOSE

What you can do with Firefox DevTools MCP

Firefox DevTools MCP is a Model Context Protocol (MCP) server published by mozilla. It ranks #609 of 171,126 active servers on MCP Toplist, and its repository has 553 GitHub stars. Firefox DevTools MCP is listed across 2 registries — Official MCP and Glama, with 4 tracked versions. It was first listed on Oct 19, 2025 and most recently updated on Oct 28, 2026.

Not verifiedMCP Toplist has not yet written a checked profile for this server, so the paragraph above is assembled from registry data only. The repository README is the authority on what it does.

CAPABILITIES AND LIMITATIONS

What Firefox DevTools MCP can and cannot do

Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.

REQUIREMENTS

What you need before using Firefox DevTools MCP

DeclaredNo credentialsNo credentials declared

The registry listing declares no required environment variables or authentication. This is declared metadata, not a verified install — the repository README is the authority.

Declared by Glama, last synced Nov 7, 2026. Not independently verified by MCP Toplist.

Declared in the registry install config

FIREFOX_HEADLESS · optional
START_URL · optional

INSTALLATION AND FIRST TASK

Connect Firefox DevTools MCP and confirm it works

npm package

claude mcp add firefox-devtools-mcp -e "FIREFOX_HEADLESS=<your FIREFOX_HEADLESS>" -e "START_URL=<your START_URL>" -- npx -y @mozilla/firefox-devtools-mcp --tool-preset developer

Replace each placeholder with your own value before saving.

npm package

[mcp_servers.firefox-devtools-mcp]
command = "npx"
args = ["-y", "@mozilla/firefox-devtools-mcp", "--tool-preset", "developer"]

[mcp_servers.firefox-devtools-mcp.env]
FIREFOX_HEADLESS = "<your FIREFOX_HEADLESS>"
START_URL = "<your START_URL>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "firefox-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/firefox-devtools-mcp",
        "--tool-preset",
        "developer"
      ],
      "env": {
        "FIREFOX_HEADLESS": "<your FIREFOX_HEADLESS>",
        "START_URL": "<your START_URL>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "firefox-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/firefox-devtools-mcp",
        "--tool-preset",
        "developer"
      ],
      "env": {
        "FIREFOX_HEADLESS": "<your FIREFOX_HEADLESS>",
        "START_URL": "<your START_URL>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

npm package

{
  "servers": {
    "firefox-devtools-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/firefox-devtools-mcp",
        "--tool-preset",
        "developer"
      ],
      "env": {
        "FIREFOX_HEADLESS": "<your FIREFOX_HEADLESS>",
        "START_URL": "<your START_URL>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "firefox-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/firefox-devtools-mcp",
        "--tool-preset",
        "developer"
      ],
      "env": {
        "FIREFOX_HEADLESS": "<your FIREFOX_HEADLESS>",
        "START_URL": "<your START_URL>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "firefox-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/firefox-devtools-mcp",
        "--tool-preset",
        "developer"
      ],
      "env": {
        "FIREFOX_HEADLESS": "<your FIREFOX_HEADLESS>",
        "START_URL": "<your START_URL>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

First successful task

After adding the config, ask your client to list this server's tools. A tool list confirms the connection; an empty list or an error means the server did not start or needs credentials.

MAINTENANCE AND EVIDENCE

What changed, and when this was checked

First listed: Oct 19, 2025
Latest version published: Oct 28, 2026
Version history: 4 versions tracked (below)
Requirements evidence: Declared by Glama, last synced Nov 7, 2026. Not independently verified by MCP Toplist.
Profile checked: Not yet — purpose, capabilities and requirements above come from registry data only
Ranking data as of: Nov 7, 2026

Registry sightings

Glama ↗listed since Apr 26, 2026 · still listed
Glama ↗listed since Jun 12, 2026 · delisted, last seen Aug 7, 2026
Official MCP ↗listed since Sep 22, 2026 · still listed

Do you maintain Firefox DevTools MCP? to correct or enrich this profile.

VERSIONS

Available versions (4)

Version	Published
0.10.7	Oct 28, 2026
0.10.6	Oct 16, 2026
0.10.5	Oct 9, 2026
0.10.4	Sep 22, 2026

STANDING

#609of 171,126 active serversTop 0.5%

Ranks ahead of 170,517 of 171,126 servers on MCP Toplist.

Recent momentum

+420GitHub stars since Apr 27 (+316%)

BADGE

Show your rank

Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.

Markdown

[![MCP Toplist](https://mcptoplist.com/badge/io.github.mozilla%2Ffirefox-devtools-mcp.svg)](https://mcptoplist.com/server/io.github.mozilla%2Ffirefox-devtools-mcp)

HTML

<a href="https://mcptoplist.com/server/io.github.mozilla%2Ffirefox-devtools-mcp"><img src="https://mcptoplist.com/badge/io.github.mozilla%2Ffirefox-devtools-mcp.svg" alt="MCP Toplist: Top 1% of 171,126" /></a>

Variants: append ?metric=score or ?metric=stars to the image URL.

FAQ

Frequently asked questions

Who maintains Firefox DevTools MCP?: Firefox DevTools MCP is maintained by mozilla, which publishes 1 MCP server (4 total versions) tracked on MCP Toplist.
Is Firefox DevTools MCP listed on the Official MCP Registry?: Yes — Firefox DevTools MCP is listed on the Official MCP Registry, alongside Glama.
How many versions does Firefox DevTools MCP have?: MCP Toplist tracks 4 versions of Firefox DevTools MCP, most recently published on Oct 28, 2026.
Where can I find the source code for Firefox DevTools MCP?: The source code for Firefox DevTools MCP is hosted at github.com/mozilla/firefox-devtools-mcp.

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