The problem can be corrected by updating your system to the following package versions: Ubuntu 13.04: xul-ext-ubufox 2.7-0ubuntu0.13.04.1 Ubuntu 12.10: xul-ext-ubufox 2.7-0ubuntu0.12.10.1 xul-ext-unity 2.4.7-0ubuntu0.2 Ubuntu 12.04 LTS: xul-ext-ubufox 2.7-0ubuntu0.12.04.1 After a standard system update you need to restart Firefox to make all the necessary changes.
https://ubuntu.com/security/notices/USN-1924-2
https://ubuntu.com/security/notices/USN-1924-1
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1208039
https://launchpad.net/ubuntu/+source/ubufox/2.7-0ubuntu0.13.04.1 https://launchpad.net/ubuntu/+source/ubufox/2.7-0ubuntu0.12.10.1 https://launchpad.net/ubuntu/+source/unity-firefox-extension/2.4.7-0ubuntu0.2 https://launchpad.net/ubuntu/+source/ubufox/2.7-0ubuntu0.12.04.1
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