Around since the release of Firefox 54 many, many times all tabs have turned to black. Nothing outside of the Firefox UI can be seen and and restarting browser has been necessary. The change is instant and is related to crashing Nvidia driver (I've recently performed a fresh installation).
The color isn't necessarily black, I've seen at least grey, blue and purple in addition.
the parts in blue are edited
This issue has been reported on Firefox's bugtracker: https://bugzilla.mozilla.org/show_bug.cgi?id=1163440