Wha? I tapped the little diagonal expandy-arrows in the top corner and it went full screen.
No such button on my screen. Android v14, Firefox.
Even worse on Firefox/Windows: play button doesn't activate when clicked
I hate that default click action is mute and that the cursor is replaced with speaker.
I actually thought that was a neat touch, since that's one of my most frequent interactions with an online video. But it needs to be overridden when the pointer is over the other controls. I couldn't scrub through the video on desktop without repeatedly muting/unmuting.