Maybe the 'best moderator of this forum ever (MOG)' could jump over his shadow and take over this forum for a short time, as an interim moderator so to speak? Please!

What the hell does that mean? It's open now. But in fact there are very big differences to the former subforum. It's not usable like this.

https://www.reddit.com/r/FirefoxCSS/

Screen from feedreader (comes just now, but look at the date (4days)):

Why in userContent?
The code belongs in userChrome!
Look at the answer of your post here:

https://www.reddit.com/r/FirefoxCSS/comments/181dzn9/change_the_color_of_this_separators_in/

No! This is an 'modal-dialog', it is not a window nor a website, and it is a part of chrome!
https://developer.mozilla.org/en-US/docs/Web/API/HTMLDialogElement/showModal

Wait and see and drink tea, not alcohol!🥴😵‍🤢