I signed back into my computer today, which has been on forever, and found Firefox open with no file menu, no unity icons, and no system icons. I used Firefox to search for a solution and found F11 to toggle full screen mode. But when I exited Firefox I then had no unity icons, no file icons, and no system icons. Hitting all of the F keys (great pun huh) resulted in no activity. How does one get this stuff back and what happened to turn them off?
Note my wife had logged in and given up. Not patient enough for Ubuntu 12.04.