I have no problems with AdBlock plus on FF currently, but using private browsing on Utube since they started detecting ad-blockers. I also generally use Utube less as well, so not so bothered.
Because it has not been updated to the problematic version, which is 5.17. In fact AdBlock on AMO is still 5.4.2, i.e. 13 versions behind latest official AdBlock version, it was last updated in Feb. 2023.