Speaking of adblock experience with Firefox (and uBlock origin), Google has managed to slip ads into my Youtube experience. So far I can skip them after watching the first 5 seconds so it's not too bad.

Before that they had a popup that would timeout after 15s (?). At that point I tried disabling uBlock on Youtube but found the ads stacked up to much longer, so the 15s delay was more acceptable.

As expected, this will probably continue to be a cat and mouse game.