bill - 7:43 am on Jun 6, 2012 (gmt 0)
If you allow it FF will now automatically update similar to Chrome, without nagging you at all. When I setup someone else's machine I always make sure the automatic update is turned on. That's a huge maintenance timesaver.
I can't recall when that disappeared officially, but this Mozilla KB article indicates it was sometime after version 4: [support.mozilla.org...]