I'm sorry, but I have to say: Oh no, you did it again!
The dark mode is terribly ugly, which is why I never used it. However since FF 106 it's the default in private windows. Contrary to the advertising it doesn't make me feel "more private", but makes me feel disgusted that I have to find out how to disable another unsolicited user interface change.
My advice is simple: No matter how bored your designers are, just resist the urge to change something for the sake of change or to make a "fresh new design". History has shown that it only makes things worse and we aren't back to status quo yet with the tab buttons.
Just don't do it. Keep things as they are! People want to keep the things they are used to instead of having to adapt constantly.
