Good to hear, I know tabs is the best thing about firefox and it's seperation from the windows OS. I am not of fan IE in any way shape or form, but at least MS is FINALLY playing catch up.
I assume most everything SHOULD be okay here, but if you run into any problems on this site let me know and I will look into it. I should get the upgrade int eh coming days and play around. It should really only be problematic with Javascript and CSS.