I can see dislikes on Firefox, logged in or out, but only if I'm in a non-private browser. Private browser hides them.
The bad thing is, people have been predicting the death of Youtube for years, and that fucker is still going. It's like Zombie Simpsons, it won't die no matter how shit it gets.
The good thing is, Youtube's growing less and less culturally relevant, and has been for some time. The younger userbase has mostly abandoned it in favor of Tiktok, niche users have been driven to alternatives like Bitchute and Twitch, and while Google keeps hoping to push crap like Youtube TV, that's not going to happen any more than Google+ did. It may be hard to see NOW, but I think YT is already in a similar position to Facebook circa five years ago; pretty soon, it's going to be only you and your grandma, stuck in a 2010s timecapsule.