I've gotten one popup about it. Hit the X to close it and it hasn't come back. Windows 10, Firefox, ublock origin.

Crazy thing is a make a white list for creators I enjoy and sub to but if I'm just looking to kill some time at lunch or looking for something time sensitive I don't want to be bothered by an ad for a video I'll be on for 5 second only for it not to be what I need then move on to the next video to watch another ad

YouTube is severely forgetting it's place on the internet.