Johnathan Nightingale, director of Firefox engineering, .

"All DigiNotar certificates will be untrusted by Mozilla products," said Nightingale, who also said that the Dutch government had reversed its position of last week -- when it had asked browser makers to exempt its DigiNotar certificates.

"The Dutch government has since audited DigiNotar's performance and rescinded this assessment," Nightingale said. "This is not a temporary suspension, it is a complete removal from our trusted root program."

On Saturday, Piet Hein Donner, the Netherlands's Minister of the Interior, said the government could not guarantee the security of its websites because of the DigiNotar hack, and told citizens not to log into its sites until new certificates had been obtained from other sources.

The DigiNotar breach is being audited by Fox-IT, which told the Dutch government that it was likely certificates for its sites had been fraudulently acquired by hackers.