They just released a new version that fixed this issue - at least for me

Right- click on menubar, select “customize toolbar”, select " titlebar" on left bottom. See here: https://www.reddit.com/r/kde/comments/udvxje/why_are_the_window_decorations_for_firefox/

Or simply imagine you just took your most violent shit of the century and then have an ad for hot mexican food or something.

Dropping in a coin vs what seems to be downloading some sort of an app or at least opening some shady websites on your fucking phone over your fucking mobile data is where I see it. Even if you used the payment option, you’d have to disclose your online payment information to the provider. Privacy nightmare.

KNU+Kinux

To be fair, this screenshot also does not have the default adwaita icon pack selected but instead something what I think might be the Mint theme(?)

Invidious is a Youtube front end (nothing bad about that per se, it just connects to the same google servers) and Nebula as well as Floatplane are paid afaik.

Is this something that could maybe improve the instant mix feature?

Has anyone heard about disroot.org? Is it a trustable service? Am considering switching there

It says here that LibreTube works, and I just checked and can confirm. In its settings, choose SponsorBlock -> Enable DeArrow.