When youtube is fullscreen, other programs appear overlayed on top of video
Hi When I am playing a youtube video in fullscreen in firefox, I sometimes see other programs or videos overlayed on top of the fullscreened video. I have attached an example screenshot.
When I google for youtube fullscreen problems, pretty much the only advice I have found is to disable or enable hardware acceleration. Neither work for me.
I am using Ubuntu 16.04, if that helps.
I believe this person had the same problem, but unfortunately for me their problem went away by itself. Mine did not.