Problem playing youtube video on Firefox Android without their app

Step to reproduce: 1. uninstall/disable youtube App on your mobile device 2. go to youtube mobile site 3. try to play any youtube video.
Result: The Firefox black out and freeze.
My user agent is "Mozilla/5.0 (Android; Tablet; rv:23.0) Gecko/23.0 Firefox/23.0"
Dolphin, Angel and Chrome browser plays the video in this condition so I'm guessing this is Firefox bug.
Is this an already reported bug?

On the Firefox browser, is the YouTube website you are visiting the mobile version of YouTube or is the desktop version of YouTube showing?
Thanks!

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