Hi, I have a ~70% rate of SSL certificate errors on secure connections. The security.enterprise_roots.enabled is set to true. Certificate database reset. A colleague has a similar problem. Possibly Firefox cannot work with our corporate network or Sophos antivirus. IE, Chrome and Opera are happy. Example from "Your connection is not secure" --> "Advanced" window support.mozilla.org uses an invalid security certificate. The certificate is only valid for sumo.external.zlb.scl3.mozilla.com Error code: SSL_ERROR_BAD_CERT_DOMAIN