On July 3, Canonical published details about a Firefox regression for its Ubuntu 13.04, Ubuntu 12.10, and Ubuntu 12.04 LTS operating systems.
According to Canonical, a previous update, USN-1890-1, introduced a regression in Mozilla Firefox, which caused the internet browser to use the wrong network proxy settings.
This latest update fixes that problem. For a more detailed description of the security issues, you can visit Canonical's security notification.
Users can simply fix the security flaws by upgrading their operating systems to the latest 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, but you will have to restart the application.
Alternatively, you can download Mozilla Firefox 22.0 right now from Softpedia.