Stylus is a browser extension to restyle the websites via CSS themes, compatible with Chrome, Firefox, and any Chromium-based browsers.

Highlights

• No analytics/tracking - this is our foundational principle as Stylus was created solely because the original Stylish extension was sold to a Web analytics company.
• Lots of themes in external galleries like USW, USO archive, greasyfork:
  • click the Find button in the popup UI,
  • click the screenshot to apply the style to the website,
  • click the screenshot again to uninstall the style.
• UserCSS styles with advanced customization installable from any raw plain text URL.
• Cloud sync for Dropbox, GDrive, OneDrive, or any WebDAV-compatible server.
• Backup to a JSON file compatible with other userstyles managers.
• Auto-update for styles, configurable in each style and globally in the options.
• Lightweight content script (~10kB) in the web pages runs in about a millisecond.
• Lots of options to configure UI and behavior.
• Built-in editor for your own CSS themes (CSS/LESS/Stylus) that highlights problems using up-to-date linters (Stylelint and CSSLint-mod) with customizable rules.
• Support for external IDE or advanced editor via the live reload feature e.g. you can write SASS/SCSS by setting up a build step to produce standard CSS in a separate file that will be tracked by Stylus.

Screenshots

• Manager

  

• Installer

  

• Editor

  

• Popup search

  

• Popup config

  

• Manager config

  

• Options

  

Releases

1. Chrome Web Store or beta
   for modern Chrome (v128+) and Chromium-based browsers like Brave, Opera, Vivaldi.

2. Mozilla addons or beta (as an xpi file)
   for Firefox and any Gecko-based browser.

3. Zip file with -mv2 suffix to load as an unpacked extension
   for older Chromium-based browsers which only support ManifestV2 version.

Pre-release test builds (nightlies)

1. click a workflow entry in https://github.com/openstyles/stylus/actions/workflows/ci.yml,
2. download the file in Artifacts - this requires a github.com account,
3. install it, see the instruction.

Asking questions, participating, contributing

• Bugs, discussions, questions, ideas, pull requests: https://github.com/openstyles/stylus
• Wiki for many common tasks and questions: https://github.com/openstyles/stylus/wiki
• Discord: https://discordapp.com/widget?id=379521691774353408
• Helping with translation: https://explore.transifex.com/github-7/Stylus/
• Guidelines and more info: https://github.com/openstyles/stylus/CONTRIBUTING.md

License: GPLv3

• Copyright © 2017-2025 Stylus Team
• Copyright © 2005-2014 Jason Barnabe for the ever diminishing parts of the original Stylish.
• Licenses of modified external libraries: vendor-overwrites.