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.
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
- Chrome Web Store or beta
for modern Chrome (v128+) and Chromium-based browsers like Brave, Opera, Vivaldi.
- Mozilla addons or beta (as an xpi file)
for Firefox and any Gecko-based browser.
- Zip file with
-mv2suffix to _load as an unpacked extension_
for older Chromium-based browsers which only support ManifestV2 version.
Pre-release test builds (nightlies) 
- click a workflow entry in https://github.com/openstyles/stylus/actions/workflows/ci.yml,
- download the file in
Artifacts- this requires a github.com account, - 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 !Discord
- 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.