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.
My videos play fine but my side bar is completely gone. No recommended videos, no similar videos, no playlist. Works fine on my other PC.
It’s underneath on mine, with the contents in the sidebar. Looks shite.