Gentoo has issued updates for mozilla, firefox and thunderbird. These fix some vulnerabilities, which can be exploited to cause a DoS (Denial of Service), detect the presence of local files, spoof the file download dialog, disclose sensitive information, or potentially compromise a vulnerable system.

For more information:
SA13687
SA12956
SA13144

Solution
Mozilla users:
Further details available to Secunia VIM customers

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers