Firefox allows you to have separate user profiles, hence keeping bookmarks, settings, extensions etc.. totally separate.
Job jobbed.
And i used it for about an hour. Its shit
Compared to what?
Us PC users are pretty fucked when it comes to browsers.
Safari doesnt render fonts properly so it looks like you're reading pages pissed, IE is buggy and constantly hijacked and fucked over, Opera is just plain slow over networks and Google Chrome dies everytime you have any user profile issues.
Granted some of these are network problems that wont affect home users but still, Firefox doesnt suffer any of these and is the fastest (bar Chrome which is silly fast but, as said, unreliable).