MozillaFirefox: Update to version 15 (critical)

Mozilla Firefox, Thunderbird, xulrunner, seamonkey 15.0 update bnc777588 MFSA 2012-57/CVE-2012-1970 Miscellaneous memory safety hazards MFSA 2012-58/CVE-2012-1972/CVE-2012-1973/CVE-2012-1974/CVE-2012-1 975 CVE-2012-1976/CVE-2012-3956/CVE-2012-3957/CVE-2012-3958/CVE- 2012-3959...