Firefox v.16.0.1 was offered to release channel users on October 11, 2012
(Version 16.0 didn’t last very long did it!)
Vulnerability ratings: 2 Critical
Evaluation: it is time to update again.
The vulnerability could allow a malicious site to potentially determine which websites users have visited and have access to the URL or URL parameters. At this time we have no indication that this vulnerability is currently being exploited in the wild.