When playing embedded videos in fullscreen, a border appears around all the edges of the video except the top. The border is only a few pixels wide, and shows the desktop, as if it is behind the embedded video. The background (desktop) can not be interacted with at this time. This error occured approx 2 days ago. I believe it is a firefox issue as i have tried multiple other browsers and they all work fine. I have also tried multiple video streaming sites and the problem occurs with all of them.