A new version has been made available in Ubuntu's repositories
Canonical published in a security notice details about Firefox vulnerabilities for its Ubuntu 12.04 LTS, Ubuntu 11.10, Ubuntu 11.04, and Ubuntu 10.04 LTS operating systems.According to Canonical, several security issues were fixed in Mozilla Firefox. It was discovered that the browser engine used in Firefox contained a memory corruption flaw and that Firefox allowed improper access to the Location object.
A remote attacker could have caused Firefox to crash, potentially execute arbitrary code as the user invoking the program, or obtain sensitive information.
The security flaws can be fixed if you upgrade your system(s) to the latest Firefox, specific to each operating system. To apply the update, run the Update Manager application.
In general, a standard system update will make all the necessary changes. A system restart won't be necessary to implement the changes.
Alternatively, you can download Mozilla Firefox 16.0.1 right now from Softpedia. Previous version, Mozilla Firefox 16.0 was pulled out of the repositories because of the aforementioned security problems.