Went with Brave as the browser to watch YT vibs for months now. It also suppresses advertisements, which is fine except when I want to help support the channel owner by watching a min of 30 seconds per ad.
My circumstance on laptop, windows 10, FF 127 on YouTube videos; takes seconds/minutes to start, freezes during playback, play/pause button does toggle but circle still moves. And the ads go black or gray square until 'skip' appears.In FF 126, still ...