Replying to Firefox issue please help

So I just upgraded to version 3, and now every time i type in a website in the nav bar it will jump up with a list of my bookmarks instead of just ones that i had already typed in like in the old version.  I have looked all over the menus for a way to switch it off so it doesn't try to predict what im typing in but it doesn't do it.  The only way I can think of would be to delete all my favorites but I really don't want to do that.

Thanks in advance for the help