same problem on ubuntu 18.04.1 LTS and firefox 64.0+build3-0ubuntu0.18.04.1 tested with Netflix and Amazon Prime Video, I can see wallpaper and desktop icons under the videos with both firefox windowed or in fullscreen mode
same problem on ubuntu 18.04.1 LTS and firefox 64.0+build3- 0ubuntu0. 18.04.1
tested with Netflix and Amazon Prime Video, I can see wallpaper and desktop icons under the videos with both firefox windowed or in fullscreen mode