My security update history says that Firefox 3.6.8 was successfully installed on Dec. 31, 1969. ????
Firefox Security Updates 3.6.8/3.6.7/3.6.6/3.6.4 all say they the update was successfully installed on Wednesday, December 31, 1969 7:00:00. One of the #s is (20100722155716).
Wšykne wótegrona (4)
This can happen sometimes, the update would have installed successfully and is nothing to be concerned about. If the update process fails to retrieve the date from the operating system, it will default to 31st December 1969 or 1st January 1970 depending on your time zone.
So the security updates are completed successfully even though the dates are incorrect? I don't need any further action since I've already checked manually for further updates?
Correct.
If the updater wasn't able to retrieve the date from the OS then 0 (zero) is used instead.
Firefox uses the Unix EPOCH that starts with Jan 1, 1970 and that date is corrected for the time zone.