I just bought a Macbook Pro and I'm starting to get use to it. But I have a problem with my dock. I want to add Firefox to the dock but whenever I drag it from the applications folder it won't stay there permanently. It goes away whenever I restart or log out. Is this normal? I've tried opening it then clicking keep in dock but it still doesn't stay there permanently when I restart it. Any suggestions? Also changes I make to some applications don't stay permanent either. HELP!!