does not work on loaded local pdf files. stylus says "Firefox forbids access to the site, In Firefox 60 and newer you need to remove this domain from extensions.webextensions.restrictedDomains in about:config."

however the local files are not in any domain

I'm a big noob. This extension is too cluttered.

Slow or unresponsive. It's a waste of time to even try to get it working

It's an absolute mess, the way it works, when it feels like working at all.

Slowpoke... Takes about 5 minutes for it to understand that the ONLY style actually DOES exist. Until that it strongly believes that there is absolutely NO styles.

Since early 2020, sadly this extension seems to have been abandoned and is so slow it's 99.9% unusable. I used to love it and would've happily paid for it.

クソ以外の何物でも無い。
今まで設定していたユーザーCSSが全然効かないうえに、再度管理画面から中身をチェックしたら、コードが消えてるじゃねえか。
欠陥品も良いとこだ。

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Screenshot　→　http://or2.mobi/index.php?mode=image&file=186872.png