Created attachment 806249 [details] Screenshot of problem User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.37 Safari/537.36 OPR/17.0.1241.18 (Edition Next) Steps to reproduce: Snap Firefox Metro to a smaller state than full screen Now snap it back to full screen Actual results: A part (the part that wasn't used by Firefox Metro before changing snap state) of Firefox Metro is covered with a black screen. But it still detects pointer-events on buttons (you can still click on the buttons in the black screen part, but you can't see them). Expected results: Firefox Metro shouldn't be covered by a black screen.
OS : Windows 8.1, but that's not the problem. Since I've had a worse problem before on older versions of FFX Metro (Windows 8.1 or not it doesn't change a thing). The old problem seems fixed now.
This bug is now fixed from 19/09/13