Darn, ublock also no longer works on Firefox for YouTube. At the beginning of each video there is one forced ad and sometimes the video stops for no reason.
I suppose they want everyone to stop using the Internet and read books.
Works for me. I have Youtube on constantly when at my desk as background noise and uBo is still blocking everything perfectly fine.
Edit: Seems Google/Youtube are experimenting/testing with injecting ads directly into the video streams:
https://old.reddit.com/r/uBlockOrigin/comments/1de9kv5/youtu...
You probably need to update your filter lists. There is a megathread on Reddit for this issue, because it can have a lot of other causes also.
https://old.reddit.com/r/uBlockOrigin/comments/1etvawp/youtu...
The Brave Browser still blocks YouTube ads.
Disable all other extensions and update your lists. It will work then.
I run uBO on FF, and I've yet to see any forced ads or video stops.
I'm on FF 131.0.2 with uBO 1.60.0.