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An HTTPs site gets the nasty "This Connection is Untrusted" on Firefox 12 on Mac - however works on Firefox 12 on PC and all other major browsers on Mac and PC

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  • 16 have this problem
  • Last reply by cor-el

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Works on all other browsers on both PC and Mac, only Firefox (and I have the latest version 12.0 on both PC and Mac) has the issue, which of course will make everyone seeing this scary popup click the "get me out of here" button.

What is causing this issue to happen on the very specific setup of Firefox 12 on Mac and not anywhere else?

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Does it mention a cause in the technical details why the certificate is untrusted?

You may have a corrupted "VeriSign International Server CA - Class 3" certificate.

You can check that certificate in the Certificate Manager to see if it OK.

  • Firefox > Preferences > Advanced : Encryption: Certificates - View Certificates > Authorities

Stored intermediate certificates show as "Software Security Device" in the "Security Device" column in the Certificate Manager.
Build-in root certificates show as "Builtin Object Token" on the Authorities tab in the Certificate Manager, so do not remove those.
You can try to remove the currently stored intermediate certificate to make Firefox store a new version.