I powered on the computer, and did not open anything other than Carbon Copy Cloner. I then copied one entire hard drive to another. Everything works, such as Thunderbird and Opera Next, except for Firefox! As it's my primary browser I have spent an hour or two trying to work out a few things. This was the second Carbon Copy Clone I did and it didn't state any errors during the copy process. Firefox was working flawlessly on the other hard drive. If I open Firefox it goes straight to crash reporter - no Firefox window. If I try and open profile manager the same happens, and if I try and open in safe mode the same happens. I have tried repairing disk permissions. There is no sign of Firefox being open in Activity Monitor