I feel you. I have similar issues.

I've ALWAYS been a loyal Firefox user pretty much since it released but it's just unusable for some things now. I never used Chrome and I'd like to avoid it but it's getting difficult.

I luckily have Graphene on my phone so I use Vanadium, which I'm trusting is as solid as people say, but on my Linux desktop I'm kinda shit out of luck. I still mostly use Librewolf but issues persist. I ended up mostly using Chromium but people said that wasn't good so I have started using Brave since I was told that was better but I'm not particularly happy with it and I'm not convinced it's much safer than Chromium, which I never considered particularly safe anyway. No real options, I guess.