What's up with Firefox and YouTube?

I applied the latest Firefox update today (31.0), and now YouTube is messed up. Going to the usual "www.youtube.com" automatically redirects to 'http://m.youtube.com/?". It's a completely different layout (I understand it's designed for mobile devices), and all the video links are in "RTSP" format or something. I can watch YouTube videos if they are embedded in another page (like www.periodicvideos.com), but seeing them on their own...

What gives? How do I get YouTube back?

Batoon2014-08-09T21:55:59Z

Rhydon's horn can crush even uncut diamonds. One sweeping blow of its tail can topple a building. This Pokémon's hide is extremely tough. Even direct cannon hits don't leave a scratch.