Display problem, not sure what happened

[JBenson]

I was watching shows on Hulu today for a couple of hours and after I logged out of my profile on the computer I can see the Firefox window that I had open still in the background of the computer...it's hard to explain but it's almost as though it's shadowed in the background of my computer...I've never experienced anything like it! Is there a way I can get rid of it?

 

[MacTribe]

try Force Quit?

(cmd + alt + esc)

Or restart your machine!