I've been using this version since yesterday and already, I find it so much better than version 1.0.7. It seems that they've sorted the performance problems and the lockups that I was having with various multimedia plug-ins. Rendering looks a bit better and XUL looks like it's been cleaned up finally too. There's been a nasty vertical scroll bar bug that took down the Mac applications since the original beta of XUL. Considering the various problems I've had with lockups, I decided to simply replace the production version with the beta version. Nothing like a good scare to keep you awake, right? Try it, you'll like it.