First time I've done a bug report so bear with me. I was attempting to play
news video from Ruv.is which needs DRM. It plays fine on Chrome, does not want
to play currently on Firefox even though I had enabled DRM. 

But when I played the same website on Epiphany it froze the screen. Did not
freeze the laptop as I still could check on Number Lock. But it would not let
me change programs or anything else after that. So had to restart the laptop.