I now consider this add-on all but abandoned. To be fair, it does technically work as described, namely for those that want to implement their own small custom personal scripts. The issue is that the plugin is completely tied into their userstyles site, which has been absolutely crippled for years. It is near impossible to get the pages to load, and without that ability there is no way to find and download professional themes, or access support materials. Do yourself the favor and choose an option with developers that take pride in ownership over the quality of their work.

Good for themes, but everything is SO SLOW. the extension itself would NEVER load themes when you click on it for the GUI to appear. The website is so slow it just gets 504 timeout errors. The servers are impossibly slow and this extension is only usable when you finish waiting.

its very slow website

без включенного расширения нагрузка на процессор браузера около 3%,после включения 35-50

es muy buena aplicacion

As per the Wikipedia article: https://en.wikipedia.org/wiki/Stylish is owned by an AD COMPANY RECORDING YOUR BROWSING HISTORY! (Use the community created STYLUS addon instead, which does not collect anything)

Doesn't work. I created a style for a website and gave it the URL. It says it's installed for that site but doesn't change anything. If I follow the instructions on github "Applying styles to specific sites" I get "unsupported rule". The website is filled with broken links and pages loading with errors, so you can't find any information. Total waste of my time, uninstalling.

Жутко виснет оф сайт разработчика, не удобно настраивать шкурки сайтов

Cool idea, but every theme is anime, it's not easy to filter them out, and the website you use to browse the themes is slow as molasses.