This is very pointless but might aswell share.. If your using firefox then type this into the address bar..Laugh at the effect chrome://browser/content/browser.xul Like i said...Sooooooo pointless lol
And you can fill up the screen and use it to freak out your dad when he comes back to his browser. xD Nice find.
I did that on my dads computer, like YourClone suggested, and he was like "WTF IS WRONG WITH MY INTERNET" when he came back. Thanks for the idea, and nice find.