Created attachment 853507 [details] Screen shot showing fullscreen offset Description of problem: HTML fullscreen is offset Version-Release number of selected component (if applicable): 29a1 (Jan-17th build) How reproducible: Any page that invokes the HTML fullscreen API - https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Using_full_screen_mode Steps to Reproduce: 1. Open a video that Firefox can play back ex. http://videos-cdn.mozilla.net/brand/Mozilla_Firefox_Manifesto_v0.2_640.webm 2. Right click on the video 3. Select fullscreen Actual results: Video plays in full screen however the video will be offset (I suspect that the offset is the Firefox toolbar height) Expected results: Video plays full screen centered Additional info: There are plenty of other ways beside video to trigger HTML fullscreen. Mozilla's nightly does not have this problem.
This is also a problem for f11 or menu > view > fullscreen.
I can see it also when source browser is launched. "View Page Source" gives clipped source view.
Moving upstream https://bugzilla.mozilla.org/show_bug.cgi?id=979839