I'm still seeing the issue playing video files on Firefox on Androied that was reported in bug 30859. Here are steps to reproduce as Naoki commented in https://bugzilla.mozilla.org/show_bug.cgi?id=728486#c9:
- go to http://en.m.wikipedia.org/wiki/Red_panda [either on fennec or with Fennec ua on desktop]
- select show for "Conservation"
- scroll down to "In captivity"
- click on the play button
Expected: video to play
Actual: nothing happens.