The new firefox (still in beta) seems a lot cooler and though they have not fixed the memory leak ( I've searched about it and it seems that this bug is not in mozilla engine but rather is contracted to it when we install the flash plugin!!) which has plagued it for long now. It has some cool features such as Faster browsing (this enables faster back and forward navigation), automatic updates etc. But the most notable change is the drag and drop reordering of tab buttons. Happy browsing!