It looks like security updates for Firefox 4 are discontinued already... http://m.computerworld.com/s/article/9217837/Mozilla_retires_Firefox_4_from_security_support -- http://gnuzilla.gnu.org
It looks like security updates for Firefox 4 are discontinued already... http://m.computerworld.com/s/article/9217837/Mozilla_retires_Firefox_4_from_security_support -- http://gnuzilla.gnu.org