# FireMonkey

> Super Lightweight User Script and Style Manager

Canonical page: [https://chrome-stats.com/d/firemonkey](https://chrome-stats.com/d/firemonkey)

## Overview

- **ID:** `firemonkey`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** erosman
- **Category:** web-development,privacy-security,other
- **Daily users:** 1,808
- **Weekly downloads:** 53
- **Rating:** 4.49 / 5 (89 ratings)
- **Version:** 3.8
- **Last updated:** 2026-08-21
- **First published:** 2019-01-05
- **Size:** 3.13 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/firemonkey/)
- **Website:** [https://github.com/erosman/firemonkey](https://github.com/erosman/firemonkey)

## Description

**FireMonkey** is a modern and lightweight extension for managing user scripts and user styles in Firefox. Combining the functionality of popular managers like GreaseMonkey, Tampermonkey, Stylish, and Stylus, it offers a secure and efficient way to customize your web experience without any tracking or privacy concerns.

Key features include support for both GM3 and GM4 scripting functions, secure dedicated APIs, easy enabling/disabling of scripts and styles from the toolbar, and capabilities for importing/exporting scripts, styles, and preferences. FireMonkey also supports script updates, web installations from popular repositories (GreasyFork, OpenUserJS, Stylish), and offers developer tools such as a scratchpad and error logs. It is open-source, free from advertising, and comes with a detailed help guide, making it a great tool for Firefox users wanting advanced customization options with minimal overhead and high security.

## Rankings

- #2,333 — Overall
- #253 — Web Development
- #375 — Other extensions
- #30 — money
- #81 — keyword
- #107 — script

## Permissions and access

### Permissions

- `clipboardWrite`
- `cookies`
- `downloads`
- `idle`
- `menus`
- `notifications`
- `storage`
- `tabs`
- `unlimitedStorage`
- `webNavigation`
- `webRequest`
- `webRequestBlocking`
- `<all_urls>`

### Content script matches

- `greasyfork.org`
- `sleazyfork.org`
- `*`
- ``

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

FireMonkey is praised for speed, a comprehensive feature set, and a UI that's friendlier than many rivals. Reviewers highlight built-in styles, support for both userCSS and userJS, native Firefox userscripts API, solid documentation, and a responsive developer. The main caveat is reliability on some sites: several scripts fail to run or CSS isn’t applied. A few note UI quirks and occasional import-related quirks, but overall it’s a strong Firefox tool for managing scripts and styles when compatibility varies.

### Pros

- Intuitive, user-friendly UI that is easier to use than many alternatives.
- Comprehensive feature set and well-done documentation.
- Native Firefox userscripts API support, with clear separation of CSS and JS.
- Built-in support for user styles and running both userCSS and userJS (consolidated management).
- Responsive and active developer/community on GitHub.

### Cons

- Reliability/compatibility issues with some scripts and sites (some scripts do not run or CSS is ignored on certain pages, e.g., Waze Map Editor).

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Source: [Chrome-Stats](https://chrome-stats.com/d/firemonkey)