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.
sadly, skewing stats like that gives Google more reason not to support Firefox in the long run.
Well… yes, but I assume that this specifically was sabotage. Like how Intel products have been throttling amd cpu performance for years.