User JavaScript and CSS: Customize Websites with Your Own Code

User JavaScript and CSS is a free Chrome extension developed by tenRabbits. This add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. With this extension, users can inject their own JavaScript or CSS rules onto any website they visit.

One of the main features of User JavaScript and CSS is its instant execution, allowing users to see the changes they make in real-time. Additionally, the extension supports custom library inclusion, providing users with even more flexibility in their code. The URL masking feature is another useful tool, enabling users to apply one script or CSS rule to multiple pages.

In terms of updates, versionintroduced a function for naming rules and updated translations. Versionupdated all extension libraries to their current versions. Versionfixed an error in the console and improved the domain getter from URLs. The extension also received updates to Ace Editor and jQuery. Other versions included bug fixes, feature enhancements, and updates to various libraries.

User JavaScript and CSS is a powerful extension that allows users to customize websites with their own code. Whether it's adding functionality or modifying the appearance, this extension provides the tools necessary to make personalized changes to any webpage.

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App specs

  • License

    Free

  • Version

    3.1.2

  • Latest update

  • Platform

    chrome

  • Language

    English

    Available languages

    • English
    • Russian
  • Downloads

    100

    Last month's downloads

    • 4
  • Developer

Program available in other languages



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Laws concerning the use of this software vary from country to country. We do not encourage or condone the use of this program if it is in violation of these laws.
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Is User JavaScript and CSS safe?

100/100

Score result: Clean

This file passed a comprehensive security scan using VirusTotal technology. It is safe to download.

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Scan Info

Last scan
Saturday, July 12, 2025
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VirusTotal

Softonic security commitment

User JavaScript and CSS has been thoroughly scanned by our advanced security systems and verified by industry-leading partners. This file comes from the official developer and has passed all our security checks, showing no signs of viruses, malware, or spyware.