Incidentally, Youtube does not work for me any more with uBlock Origin and whatever the strict privacy settings do in Firefox. It loads the UI but doesn't play the video or run searches, at least.
A few times i did see a still from the video for a fraction of a second, but then it got overwritten by nothingness.
Well, I wasn't much of a fan of watching videos when the same info can be conveyed in writing in 1/20 of the time. Now I just have more incentive not to bother.
Anyway, I won't investigate further. If there's a video i really really want/need to watch I can open it in Chrome, which sends all my data to Google anyway.