Comment 2 for bug 1331475

That’s a entirely separate issue.

Fullscreen doesn’t apply only to videos, it allows any element on a page to be made fullscreen (including images, div blocks, …). For those fullscreen cases that don’t involve a video, we need to provide the user an explicit way to exit fullscreen mode. See for example what firefox mobile does: http://www.html5rocks.com/en/mobile/fullscreen/#toc-letuserchoose.