Ah~ another fresh release of Firefox. Ubuntu users should be getting this within the next few days. Now with SPDY 3.1 support and TLS 1.1/1.2 enabled.
Mozilla's own Social API now supports running more than one service at a time. Multitasking 2.0? Does anybody actually make use of the services enabled by Social API?
Firefox 28 should enter Beta within a week or so.
Well, anyway, here's the release notes for the complete story.