I have the latest ff: 16.0.2.

I even tried

  $ openssl s_client -connect hacks.mozilla.org:443

from a linode vm:

  CONNECTED(00000003)
  ---
  Certificate chain
   0 s:/serialNumber=I1oZ-yurbFWiPu/xP8HIzW3f9mApQvMv/C=US/ST=California/L=Mountain View/O=Mozilla Corporation/OU=IT/CN=tbpl.mozilla.org
     i:/C=US/O=GeoTrust, Inc./CN=GeoTrust SSL CA
   1 s:/C=US/O=GeoTrust, Inc./CN=GeoTrust SSL CA
     i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
   2 s:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
     i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
  ---
  Server certificate
  [...]
  subject=/serialNumber=I1oZ-yurbFWiPu/xP8HIzW3f9mApQvMv/C=US/ST=California/L=Mountain View/O=Mozilla Corporation/OU=IT/CN=tbpl.mozilla.org
  issuer=/C=US/O=GeoTrust, Inc./CN=GeoTrust SSL CA

Any idea?