So this started coming up today. On every video. I can (so far) click the "x" and remove it to watch (still see 2 ads before the video, and one after 4 minutes - ruins music on YT), but did click the "Report issue" only for the dialogue box not to work.
I found a link to a that said 11% use adblock. Thats not a lot.Maaayyyybe there is a problem with the amount of ads youtube forces down our throats for even short videos. 🤷♂️
FF mobile currently has a very selected list of available extensions, which does not include it yet.
But that's about to change before the end of the year. FF mobile is finally opening up add on usability and distribution.