FireMonkey

Name: FireMonkey
Rating: 4.4767 (86 reviews)
Author: erosman

By: erosman

Super Lightweight User Script and Style Manager

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Features & Capabilities

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.

User Growth & Download Statistics

Add-on Privacy & Security Developer Tools

By:

erosman

Daily users:

1,810 -9

Rating:

4.48

(86)

Version:

2.74 Last updated: 2025-01-25

Version code:

5881589

Creation date:

2019-01-05

Risk:

Permissions:

Content scripts matches:

greasyfork.org
sleazyfork.org
*

Size:

999.65KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 2,322 ▼ 13

Other rankings

#263 in Web Development ▼ 3

#30 in money keyword 27 ▼ 2

#73 in keyword keyword 56 ▲ 1

#104 in script keyword 28 ▲ 1

#125 in keyboard keyword 21 ▼ 1

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For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

erosman

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/firemonkey/

Website:

https://github.com/erosman/firemonkey

User Reviews

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).

Recent reviews

by sc*****, 2026-05-09

by Fi*****, 2026-05-07

by li*****, 2026-05-05

View all user reviews ›

Is FireMonkey Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

FireMonkey requires a lot of sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

FireMonkey has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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