I haven't seen any bugs on Firefox mobile + uBlock Origin + Android + Pixel 4a 5g (I hate upgrading phones, sue me).

The only glitch I reliably get is watching videos at 1.5x sometimes freezes video (but audio still plays). Expect that's more hardware and memory pressure related tho.

Also, I wasn't aware YouTube mobile has ads? I think uBlock might be eating them. Although possibly whatever is lagging others experiences too...