This is a regression. Over the last week I've noticed the B2G video controls no longer work correctly. They appear and won't go away. They also are not displayed within the video window and are scaled incorrectly.
Test video: http://cd.pn/b2
Created attachment 634727 [details] [diff] [review]
Problem had the same cause as that identified in bug 765106 for android controls. This patch applies the same fix to b2g that was used in android.