Mozilla has revoked trust in the DigiNotar certificate authority from all Mozilla software. The scope of the breach remains unknown. Mozilla is working with Dutch localizers and the Bits of Freedom group in the Netherlands to contact individual site operators using affected certificates. The integrity of the SSL system cannot be maintained in secrecy. Incidents like this one demonstrate the need for active, immediate and comprehensive communication between CAs and software vendors to keep our collective users safe online. Mozilla has a strong history of working with CAs to address shared technical challenges and containing breaches when they do arise.”]
Source: https://blog.mozilla.org/security/2011/09/02/diginotar-removal-follow-up/