I’m A YouTube Premium subscriber, and I’ve been noticing this delay on my TV for a few days now - a very noticeable, long pause when opening the home screen until the thumbnails are loaded. I’ll explicitly check other places too now, I’m not sure if it’s also happening in Firefox for me.

I’m sorry to hear people having issues with FF. I remember the instability spell it had way back (6, 7 years ago?) but I’ve had zero issues with it on Mac, Linux and Android.