[Pkg-chromium-maint] Bug#883980: Fifth Manifestation

[Gerard M. Vignes]

I was using the latest, built-in version of Firefox ESR 52.5.2 (64-bit), 
and I noticed that I got the same, consistent problem as with Chromium.

When I move the mouse cursor between surrounding page and embedded video 
(either direction), the screen goes black for 1 second. This behavior is 
identical to what I experience in Chromium.

This is the list of applications for which I have seen this problem so far:
Chromium
Terminator
Terminal running Bash
Software
Firefox ESR