Ironically, some of the things listed to be fixed with update V3.1.0 that I just got on Firefox are broken now, some of which weren't broken before:
1. "fixed subscribe button from being displayed incorrectly" - no idea what that means, but now it's white text on white ground ... genius
2. "fixed an issue with thumbnails scaling in channel pages" - still broken as it has been forever, keeps randomly switching between 2 and 3 thumbnail columns when there's plenty room for 4 (constant viewport size)
3. "fixed precise dislikes count not working" - ok but the video dislike button is still miscolored anyway, it's always been white instead of gray when it should only be white after a dislike (comment like/dislike buttons are even both generally white instead of gray)

At least the sort by "Oldest" button is finally back, so that's a big W!

Update 2023-06-06:
OH MY GOD now even the previously at least still usable subscription feed is suddenly down from 4 to 2 columns and looks abominable! PLEASE stop screwing up what has been working before ... STOP ... JUST STOP