What is the "Stylus" extension and how does it work?

Stylus is a userstyles editor and manager based on the source code of Stylish version 1.5.2. Our objective is to maintain and improve upon the original author's version, while becoming more privacy oriented and remaining more user-friendly for style creators.

Stylus injects its own CSS into targeted pages and therefore makes you able to override the present design of a webpage. If you know CSS, you can write and create your own styles. Otherwise you can just install styles by other authors from userstyles.org (USO). You can also search for styles for the current site on USO from within the Stylus extension.

Stylus browser extension is available for Chrome, Firefox and Opera browsers.

What are the main differences and improvements over the original Stylish add-on?

1.) Any and all analytics, telemetry, and data-collection have been removed completely. We'd rather not know what you're up to.

2.) A backup feature, compatible with the one recently introduced in Stylish. To transfer your database, simply export from Stylish and import to Stylus.

3.) An automatic update feature for installed styles. You can now set your own interval for all installed styles to automatically update on their own, silently in the background.

4.) CodeMirror and CSSLint have been updated to their latest versions, respectively. Many false positive editor warnings and errors have been improved via the update, and we've added a few extra exceptions for some other common false positives.

5.) Customizable badge color for the icon. You can now specify what color you'd like the badge to be for "enabled" and "disabled" icons.

6.) A new icon state, which indicates when all styles are globally disabled.

What is new in this version?

Please check the log section in this page to find-out the recent changes. For more comprehensive list of changes, take a look at the GitHub's commit section.

How can I contribute to this extension?

PR's are welcome on Github https://github.com/schomery/stylish-chrome/issues, and you should also report any bugs you come across by opening an issue there. Participation in any form is encouraged, so feel free to browse through the issues and share your thoughts. If you're interested in lending your assistance to expedite any future progress, pay special attention to any issues labeled as "help wanted". To contribute to translations for the Stylus UI, visit transifex at https://www.transifex.com/github-7/Stylus/.

Otherwise, if you prefer a more informal method of getting in touch or starting a conversation, please leave a comment here on the discussion section. We will monitor any discussions here and join in, and it may be a more appropriate venue for opinions and less urgent suggestions.

How can I export my user styles from Stylish for Firefox add-on?

Please follow the instruction in the wiki

[Deprecated answer] Stylish for Firefox add-on does not support exporting to the JSON format at the moment. For now, use the following experimental extension to generate Stylus compatible JSON file.

1. Open about:debugging in a browser tab
2. Download this XPI
3. Point "Load as Temporary Add-on" to the downloaded XPI file
4. Wait for a few while until all your styles are converted

On successful conversion, you will get a JSON file on your desktop. This file can be exported to the Stylus add-on. Note that Stylish add-on needs to be enabled in order for the extension to be able to read Styles.