Firefox Css Theme MCP Server

A toolkit for Firefox CSS theme authors to scaffold, bundle, and live-debug theme repositories. It also provides end users with an automated installer. It runs locally over stdio via the published package.

People who work with firefox and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-13 · ★ 3 · #62 OF 168 MAINTAINED DEVELOPER TOOLS · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install Firefox Css Theme

Claude Code

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

Claude Desktop / Cursor / VS Code - add to config

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

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

repo age created 2026-08-14 - young repo, little track record yet

license MIT - declared in the repository

npm package firefox-css-theme - unscoped; check the name against the project README before installing

registry namespace io.github.easonwong-de is GitHub-verified and matches the repo owner

03 · What Firefox Css Theme can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Limitations (from the README)

[!WARNING] This operation will overwrite existing CSS themes in the profile unless --merge is specified. A backup is advised.

Latest releases

v0.2.8 · 2026-09-05

bump version to 0.2.8 · New Contributors · @github-actions[bot] made their first contribution in

v0.2.7 · 2026-09-04

bump fast-uri from 3.1.5 to 3.1.7 · bump qs from 6.15.3 to 6.16.0

v0.2.6 · 2026-09-01

04 · Who maintains Firefox Css Theme

firefox-css-theme is maintained by easonwong-de. It's the only MCP server we track from this author; the repo dates to Aug 2026.

05 · Facts

repository: github.com/easonwong-de/firefox-css-theme
category: developer tools - ranked #62 of 168 actively-maintained developer tools servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-09-05)
registry: io.github.easonwong-de/firefox-css-theme (active, first published 2026-09-01 · 4 versions)
packages: npm:firefox-css-theme

06 · Firefox Css Theme FAQ

What is Firefox Css Theme?

Is Firefox Css Theme still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-13 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Firefox Css Theme?

Run `npx -y firefox-css-theme`. You can also paste the ready-made client config above.

Does Firefox Css Theme run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Firefox Css Theme

Alternatives to Firefox Css Theme

Maintained developer tools servers if Firefox Css Theme isn't the fit.

Pairs well with

Servers that cover what Firefox Css Theme doesn't - only shown when the pairing reason fits the companion.

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