On October 26, in a security notice Canonical published details about Firefox vulnerabilities for its Ubuntu 12.10, Ubuntu 12.04 LTS, Ubuntu 11.10, Ubuntu 11.04, and Ubuntu 10.04 LTS operating systems.
According to Canonical, several flaws were found in Firefox that allowed a remote attacker to conduct cross-site scripting (S) attacks. Also, a flaw was identified in the way Firefox handled the Location object.
A remote attacker could have exploited exploit this problems to bypass security protections and perform cross-origin reading of the Location object.
For a more detailed description of the security problems, you can visit Canonical's security notification
Users can simply fix the security flaws by upgrading the operating systems to the Firefox package, specific to each distribution.
A normal system update, executed with the Update Manager, will implement all the necessary changes. A complete system restart is not necessary.
Users can also download Mozilla Firefox 16.0.2
right now from Softpedia.