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Stylus - Userstyles Manager
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.github Chore: include stylus version in the issue template (#549) Nov 8, 2018
.tx Locales (#532) Nov 3, 2018
_locales Update translations Jul 8, 2019
background Fix linting issues Sep 11, 2019
content Change: check style.sheet instead of getComputedStyle (#779) Sep 11, 2019
edit only recalc applies-to css on live-update if style targets the editor Oct 13, 2019
images/icon remove what-input, use own implementation, rebase on master Dec 13, 2017
install-usercss Add: enable usercss updateURL (#661) Feb 14, 2019
js find @-moz-doc sections faster in the editor (#786) Sep 25, 2019
manage Improve height restriction for popup config dialog (#721) Jun 1, 2019
msgbox Improve height restriction for popup config dialog (#721) Jun 1, 2019
options Popup border (#781) Sep 24, 2019
popup Popup border (#781) Sep 24, 2019
sync Move dropbox vendors (#576) Nov 29, 2018
tools Move dropbox vendors (#576) Nov 29, 2018
vendor-overwrites Fix colorpicker (#745) Jul 15, 2019
vendor Update vendor libraries Jul 8, 2019
.editorconfig Don't enforce non-native end_of_line in editorconfig Apr 18, 2017
.eslintignore refactor CSSLint Jan 7, 2018
.eslintrc Refactor the entire storage system and the section editor (#518) Nov 7, 2018
.gitattributes Locales (#532) Nov 3, 2018
.gitignore Locales (#532) Nov 3, 2018
LICENSE Adding external licenses (#424) Jul 9, 2018 Add primary header to README and replace HTML with markdown equivalent ( Sep 9, 2019
edit.html linter and compact layout improvements (#749) Aug 4, 2019
global.css simplified font CSS Aug 20, 2018
install-usercss.html Refactor: rewrite style injector (#664) Mar 10, 2019
manage.html Refactor: rewrite style injector (#664) Mar 10, 2019
manifest.json 1.5.6 Sep 11, 2019
options.html Popup border (#781) Sep 24, 2019
package.json Meta: Update dependencies Sep 11, 2019
popup.html menus as dialogs (#727) Jun 20, 2019


Stylus is a fork of Stylish for Chrome, also compatible with Firefox as a WebExtension


  • In addition to the site, styles with customizable parameters can also be installed from .user.css or .user.styl URLs (see Usercss format wiki).
  • Site styles can be discovered and previewed in the popup using inline search with screenshot thumbnails.
  • A backup feature which is compatible with other userstyles managers.
  • Configurable automatic update function for installed styles.
  • Customizable UI, optional layouts, and tweaks.
  • Two different optional code validators with user-configurable rules: CSSLint and Stylelint.
    • Both validators use Web Worker API to run in a separate background thread inside the editor tab without blocking your interaction with the code.
    • CSSLint is heavily modified compared to the effectively frozen original one and supports various CSS3 features as well as CSS4 Color and CSS Grid syntax.


  1. Chrome Web Store (or beta)
  2. Firefox add-ons
  3. Opera add-ons (see wiki for more recent version)


Style manager Style editor Popup config for usercss Popup inline search Style manager config for usercss Options



The source is hosted on GitHub and pull requests are welcome.

You can help us translate the extension on Transifex.

See our contributing page for more details.


Inherited code from the original Stylish:

Copyright © 2005-2014 Jason Barnabe

Current Stylus:

Copyright © 2017-2018 Stylus Team


This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see

External libraries

The licenses of external libraries used in this project or modified versions of external libraries can be found in their respective directory.

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