The owner of userstyles.org incorrectly configured his website. To protect your information from theft, Firefox did not connect to this website.

This site uses HTTP Strict Transport Security (HSTS) to indicate that Firefox should connect to it only through a secure connection. As a result, you can not add an exception for this certificate.

The new CSSLint feature is beyond annoying and looks stupid. It shows warning like "Don't use IDs in selectors." and "Use of !important". How is it possible to change the style without using "!important"?

There should be a way to disable it or fine tune those warnings. Or better, just completely remove it and save some CPU resources and developers' brain cells.

Firefox Quantum 59.0.3(64bit)（2018/4/30更新）にてエラーが出て使えなくなりました。
ある日突然、このようなものが出るようになりました。これが何なのか分かりません。
https://imgur.com/a/FWUlcys　直し方が分かれば教えてください。

nice

動作が重たくなるし、設定通り正しく動かない時がある。
最も重要なのが、バックグラウンドで通信している。

It doesn't work: "Возникла ошибка доступа к базе данных Stylish"

database error!

causes high cpu usage for no reason and has questionable data collection
will move on to another plugin

Very helpful in rendering Google Maps useful again, after Google changed its contrast settings.

This addon seemed to work on the past months but now! IT DIDN'T !! rather it gives me like a database error though... reinstalled then it's still same rip stylish... well i'm actually done and would never look again

As opposed to other styling plugins, this one does not apply rules that aren't marked with !important correctly, making it harder to create styles or breaking existing ones.

not very intuitive :/