Firefox CSS Theme MCP Server

by easonwong-de Your server? Claim it

local only

Firefox CSS Theme runs on your own machine — the client starts it, so there is no endpoint to ping. 409 installs a week from npm. Last commit 25 Oct 2026.

MCP for building, inspecting, and live-debugging Firefox CSS themes.

Installs per day peak 205 · avg 23 · +334% w/w

a month agotoday

409

Installs / week

npm · firefox-css-theme

Stars

0 open issues

25 Oct 2026

Last commit

16 releases in 90 days

MIT

License

TypeScript

What the code does

We read the source, 1 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable src/commands/create.ts:61

        path.join(templateDir, templateFileName),

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add firefox-css-theme -- npx -y firefox-css-theme

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "firefox-css-theme": {
      "command": "npx",
      "args": [
        "-y",
        "firefox-css-theme"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.firefox-css-theme]
command = "npx"
args = ["-y", "firefox-css-theme"]

.cursor/mcp.json

{
  "mcpServers": {
    "firefox-css-theme": {
      "command": "npx",
      "args": [
        "-y",
        "firefox-css-theme"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "firefox-css-theme": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "firefox-css-theme"
      ]
    }
  }
}

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Firefox CSS Theme — questions

Answers built from our own checks of this server.

Why is there no uptime for Firefox CSS Theme?

Firefox CSS Theme runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package firefox-css-theme was installed 409 times last week.

How do I connect Firefox CSS Theme?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls firefox-css-theme straight from npm; nothing to host, nothing to sign up for.

How many people use Firefox CSS Theme?

The npm package firefox-css-theme was installed 409 times in the last week. Week over week that is +334%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Firefox CSS Theme open source?

Yes — it is published under the MIT licence, written in TypeScript and 3 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.