YouTube says it’s not slowing down Firefox — just ad blockers - The Verge

You can build the most sophisticated ad blocker detection imaginable, it won't change that the info on the user machine itself is legally protected against collection , the result being any legal detection method inevitably has a rate of failure/false positives. So they want to enshitten the site to improve attrition for an already negligible proportion of the userbase whom actively resists? They can go ahead, can't see that playing out as intended but I'm here for it

Still zero issues here w/ firefox & ublock & sponsorblock, and every detection case I've seen reported seems to have actually been circumvented easily by the poster shortly after they took a screenshot. Seems like much ado about nothing, or perhaps fear mongering is a more effective tactic for Google at this point