It's late but Firefox 4 Beta 8 released over the week and with lots of improvements over Beta 7. Mostly it's bug fixes though. Firefox Sync gets streamlined but I'll not comment too much on that. I don't really bother with sync features since I'm not sure I like having a third party manage my browser profile for me. It's inevitable, I suppose, but I'll resist as long as I can.
More interesting is the improvements to WebGL as can be seen on this video. If it's that good, then we can expect some interesting applications soon.
Oh, and Merry Christmas! :-)
Installing Firefox 4 pre-Beta 8 on Ubuntu 10.10