What type of problems do you have? I use YouTube in Firefox on Linux almost every day and as far as I can tell it's working perfectly.

I don't go to the home page, though, only access videos via search (using !yt on Kagi) and by clicking around related videos.

I don't see any memory issues that the OP is talking about, either. Maybe uBlock is fixing it for me?

Same, it started this year. Once a week or two YT just refuses to render its page completely.

I only use ff on windows. No issue. I do have premium. May be adblocking YT is broken. I have ublock turned on too, but no issue.