UserScript Pro: Custom JS & CSS

Name: UserScript Pro: Custom JS & CSS
Rating: 5 (1 reviews)
Author: aitchess

A premium, minimalist developer tool to inject custom JavaScript and CSS into any website. Features a boutique workspace with Ace Editor, real-time injection, and advanced URL matching.

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Features & Capabilities

UserScript Pro is a high-end, boutique developer extension designed for precise web customization. It provides a clean, monochromatic environment for managing and injecting custom scripts and styles into web pages.

Key Features: - Advanced Code Editor: Powered by Ace Editor with syntax highlighting for JS and CSS. - Real-time Injection: Instantly run your code on the active tab without refreshing. - Smart Pattern Matching: Support for Glob patterns and Regex to target specific URLs. - Pro Workspace: Ultra-minimalist, distraction-free UI inspired by premium developer tools. - Secure & Performance-focused: Built with Manifest V3 and safe DOM APIs.

User Growth & Download Statistics

Add-on

By:

aitchess

Daily users:

Rating:

5.00

(1)

Version:

1.2.2 Last updated: 2026-03-20

Version code:

6189062

Creation date:

2026-01-28

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

4.01MB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 81,045 ▼ 22

Other rankings

#210 in script keyword 27 ▼ 6

For Developers

Monetize with App Pass Boost with Extension Booster

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:

aitchess

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/userscript-pro-custom-js-css/

Is UserScript Pro: Custom JS & CSS 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.

UserScript Pro: Custom JS & CSS requires some sensitive permissions that could impact your browser and data security. 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.

UserScript Pro: Custom JS & CSS is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

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