You might have noticed that even on Firefox (depending on your lists) YouTube may detect uBlock Origin on Firefox now
There's already a workaround (found, again, here), but I figured I would use this opportunity to tell people that projects like Piped and Invidious exist, which both allow you to watch YouTube without loading their ads, with improved Privacy and (in the case of Piped) even Geoblocking-Circumvention and SponsorBlock out of the box.
They're both great tools, and using something like LibRedirect you can even automatically go to Piped or Invidious when clicking/opening a YouTube link (and more).
Both don't load ads, but unless changed in the settings Individous may still make connections to Google/YouTube to load the video(s) themselves.
Bit of a shameless plug for these projects, but I figured this is a really good time to show these projects as I often see people asking what they are in threads on here
I was having really bad time with the constant adblocker warning pop-up yesterday so I disabled all other extensions, restored uBlock Origin to the default settings aswell as cleared the catche and updated filter-lists. Then I cleared all Firefox cookies and restarted it. This morning I did not get the warning unlike the few past days, so far so good. I'm sure this isn't a permanent fix, but for those of you still struggling with it, these are the steps you might want to try.