No ads, nor blockings or nasty popups in YT with the inbuild ad/trackerblocker of Vivaldi, but in FF with uBO and also in Vivaldi if i use uBO instead of the inbuild blocker, not so using Adblock Plus, which is somewhat strange.
The filterlists i use in the Vivaldi adblocker are
Yep, using vivaldi, the popup doesnt show up nor does the player get disabled nor do I see ads. And that's with just tracker blocking enabled and ubo off, dk why but no ads so far