Some Firefox users noticed playback issues on YouTube for several months. These affected high resolution videos only, from 1080p and up. To make matters worse, no clear pattern could be identified.
Some videos played fine, others would stop abruptly when they ran out of buffer.
That’s a lot of effort, given how many people I am subscribed to. And I wouldn’t say that it’ “peanuts”, after all they redistribute 55% of YouTube Premium earnings, that’s a lot more than what other similar subscriptions give.