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How to make Firefox warn about unknown certificate issuer?
Assume a corporate computer that has intrinsic software installed. It's a mitm setup that replaces the web page's certificate to one signed with a intrinsic software vendor's certificate that is trusted by the system and thus is trusted by web browsers.
But Firefox is able to tell if the certificate is signed by a trusted issuer or not but it does not warn the user, one must click the lock icon next to the address to get to know that.
How can I make Firefox scream that the issuer is not recognized by Firefox (yet still trusted due to its presence in OS)?
