For anyone seeing YT ads all of the sudden, it's this blocker addon. It conflicts with other adblockers. Disable this particular one in FF, and the rest work as they should. This one, when enabled, allows YT ads to go through. Not sure why and really don't care. I'm going back to Ublock now.
We are currently investigating an issue where ads are appearing on YouTube. You can read more about this issue (which appears to be impacting all ad blockers) here: https://help.getadblock.com/support/solutions/articles/6000109702-i-m-seeing-ads-in-youtube-videos. --AdBlock Support
