Stylus: Custom Themes for Firefox Users

Stylus is a versatile userstyles manager for Firefox that allows users to redesign their favorite websites effortlessly. This free extension is community-driven and offers a wide range of features, including the ability to install custom themes from various online repositories or create and manage personalized CSS stylesheets. Users can easily back up their entire database of installed styles, ensuring that their customizations are safe and can be restored if needed. With an intuitive and configurable UI, Stylus also allows users to enjoy a highly customizable experience through theming options, layout choices, and icon color tweaks.

The extension also includes two optional code validators with user-configurable rules, enhancing the development experience. Stylus operates with a focus on privacy, collecting no user data and requiring only essential permissions to function effectively. Although it does not apply styles to the Firefox UI directly due to WebExtension API limitations, it remains an essential tool for users looking to enhance their browsing experience with personalized styles.

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App specs

  • License

    Free

  • Version

    2.3.16

  • Latest update

  • Platform

    firefox

  • Downloads

    1

  • Size

    1.10 MB

  • 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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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
Tuesday, September 2, 2025
Scan provider
VirusTotal · Full report

File Integrity

File
2.3.16.xpi
SHA256
2cda3445f1e5e5aa95b8b814cc395079185216e10ec42d20811b0350f4c378a8
SHA1
ec92f7d3dd61c60bbfeed2621d4646e608e1a858

Softonic security commitment

Stylus 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.