Screensaver interrupts fullscreen Firefox videos

[mulcahey]

Ok, at long last, I think I've solved this.

The issue seems to be that Caffeine messed up something in my windows manager, and it remained messed up even after I uninstalled. I identified that I was running Lightdm, so I ran

Code:

sudo apt-get reinstall lightdm

And finally, FINALLY... full screen videos seem to run without being interrupted.