User-Agent: Mozilla/5.0 (Mobile; rv:44.0) Gecko/44.0 Firefox/44.0 To watch youtube we'll see unpleasent old fashion video playback control. Maybe its time to redesign it with modern look and feel.
These controls look poorly designed and there is a square box overlapping the slider which shouldn't be there. The design of the playback controls should match what we currently have for the video app.
Note that this control is not part of gaia. This is the default one provided by the platform for mobile devices that we share with Firefox on Android.
If its been styled in JS/CSS, maybe media team could help