The Inquirer reports that Firefox 16 has been pulled due to security vulnerabilities

Michael Coates, director of security assistance at Mozilla urged those who have downloaded Firefox 16 to revert back to Firefox 15.0.1. He said, "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."

Mozilla's recent move to silent, background updating means that some users will have upgraded to Firefox 16 without the need for going to Mozilla's website and downloading the web browser. The software outfit has posted instructions for those wanting to downgrade to Firefox 15, but it also said users can stick with Firefox 16 and wait for the impending patch.

  Mozilla pulls Firefox 16 due to security vulnerabilities