WebSockets seem totally broken by Firefox SOCKS settings
http://html5demos.com/web-socket is failing on both TBB 2.2.x and 2.3.x. I also tested a Vanilla FF14 with SOCKS proxy settings, and the socket also breaks there, too.
This is thus probably an upstream Firefox bug. We should at least file a bugzilla bug and bring it to someone's attention, I guess.