Playing videos in Facebook steam
Not sure if this is a bug or not, but I've noticed that when using Vivaldi and Facebook, embedded videos don't play correctly. With some, I have to hover over the video and click on the HD option before the video will display. Others, the sound is automatically muted. Looking at the element, here's an example of one video where I had to switch to an HD option to play it.
I also have this issue. All videos on facebook are just white and no image just sound. Hopefully it be fixed in one of the next updates..