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
The alternative exists, but it costs money. Most big YouTuber accounts (at least the ones I'm subscribed to) post on either Nebula, Patreon or some platform like that. It would cost quite a lot to subscribe to them all, but still less than YouTube premium in my country. So in the worst case scenario where YouTube really blocks all ad free interfaces except paid use, that's my answer. I don't like it as I think a lot of the content is overpriced for what it is, but it's better than having $$$ swallowed up by some mega corporation that is just interested in screwing authors and viewers over as much as possible.