This document tells you how you can manually import the Mozilla Root Certificate in your browser so that you don't get these warnings anymore.
If you want to generate your own CSR for Mozilla to sign, take a look at these two sites:
* http://sial.org/howto/openssl/csr/
* http://www.geotrusteurope.com/support/csr/csr_apache.htm
= Mozilla Root Certificate =