So far, I've seen nothing on Firefox -- but I am getting some minor hiccups on ReVanced which seem to be consistent with the influence of the AdBlock detection. Stuff like playback stopping after 3 videos until I unpause it, probably coming from the pop-up appearing.
Thank the good god for the incredible folks maintaining uBlock origin.
Edit: and ReVanced, and SmartTube, and Newpipe, and everything... But especially uBlock origin. That thing is a security necessity.
Original YouTube, before Google, was one of many Video streaming websites -- living alongside competitors such as Dailymotion, Vimeo... And Google video. Those guys, yes, would've deserved this sort of compassion.
Google's YouTube is an evil entity that bruteforced itself into a de facto monopoly, routinely changes the rules for content creators that have built the platform and often depend on it for their living, allows a predatory system of copyright trolls to thrive at the expense of the creators, frequently allows creators to be robbed of their channel and income by arbitrary strikes while being completely deaf to requests for help, leverages Google's power to crush potential competitors, influence public opinion, stifle free speech... I could go on. Sympathy for such an entity, quite frankly, for me, is a form of Stockholm syndrome.