I downloaded Firefox to my PC Notebook (Windows XP Professional) last night and thought it was a great program. The more I used it today, the better I liked it. However, when I downloaded a copy for my Mac, I was very disappointed. There was no option to import my bookmarks or prefs from either Safari or Internet Explorer. The interface is clearly a Windows interface (I don't recall prefs being called "properties" on a Mac). Overall, it feels very clunky. I think it has some distance before it can replace Safari. On the other hand, it is now my default browser on my PC Notebook.