Opening the FreeDesktop Bugzilla website with Firefox 3.6.12 returns the following security warning:
bugs.freedesktop.org uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
(Error code: sec_error_unknown_issuer)
By adding an exeption to Firefox, I can enter the site, but as this is a poor introduction to a bug filing site, please update your certificate.
*** This bug has been marked as a duplicate of bug 20250 ***