I just got a new Macbook Pro 17 inch. I used migrate to move Firefox and settings from 13 inch macbook to this one. I'm on latest version of Firefox (4). When I exit Firefox, its resets the resolution from the normal 1920 x 1200 to 976 x 600 (called 'supported resolution') and the on-screen pixels are giant. Its so bad, when logoff, the logon screen (shows the users on the computer) is still in this very low resolution. And then the next user to logon is stuck at this resolution too. I have have removed Firefox and reinstalled, no lock. This is a serious issue I cannot seem to resolve.