Created attachment 8432100 [details] firefox bug.mp4 User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:29.0) Gecko/20100101 Firefox/29.0 (Beta/Release) Build ID: 20140506152807 Steps to reproduce: Go to OS X fullscreen. Actual results: Sometimes (every 3rd time or so) a horizontal stripe is left black and unused on the very top of the screen (where the menubar is in non-fullscreen mode).
The video doesn't work. Please check if the issue occurs using Firefox in safe mode (with your addons disabled): http://support.mozilla.com/kb/Safe+Mode And on a new, empty profile: http://support.mozilla.org/en-US/kb/Managing-profiles#w_starting-the-profile-manager
Component: Untriaged → Graphics
Product: Firefox → Core
> The video doesn't work. Have you tried mplayer or VLC? I can reproduce this with a new, empty profile, both in safe and unsafe mode. I just noticed this is an issue only with my external monitor. Also, in addition to by entering fullscreen on the external monitor screen, I can reproduce this bug by moving Firefox already-fullscreen from my MacBook display to the external monitor. The screens have different resolution (MacBook: 1440x900, external monitor: 1920x1080)
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