SERVER

Firefox DevTools MCP

Rank #2,457

io.github.mozilla/firefox-devtools-mcp

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

1 version

431 GitHub stars

by mozilla (3 servers)View repository ↗Claim this server

First listed

Aug 18, 2026

Last publish date

Sep 22, 2026

OVERVIEW

Firefox DevTools MCP is a Model Context Protocol (MCP) server published by mozilla. It ranks #2,457 of 132,046 servers tracked on MCP Toplist, and its repository has 431 GitHub stars. Firefox DevTools MCP is listed on Official MCP, with 1 tracked version. It was first listed on Aug 18, 2026 and most recently updated on Sep 22, 2026.

STANDING

#2,457of 132,046 tracked serversTop 5%

Ranks ahead of 129,589 of 132,046 servers on MCP Toplist.

CONNECT

Use Firefox DevTools MCP

No setupRuns out of the box

No credentials or required configuration declared — add it to your MCP client and go.

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.

BADGE

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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 5% of 132,046" /></a>

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

REGISTRIES

Listed on 1 registry

Official MCP

ORGANIZATION

mozilla

Organization

mozilla

Servers in org

Versions across org

VERSIONS

Available versions (1)

Version	Published
0.10.4	Sep 22, 2026

FAQ

Frequently asked questions

Who maintains Firefox DevTools MCP?: Firefox DevTools MCP is maintained by mozilla, which publishes 3 MCP servers (1 total version) 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.
How many versions does Firefox DevTools MCP have?: MCP Toplist tracks 1 version of Firefox DevTools MCP, most recently published on Sep 22, 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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