Resolution
To import the CACert certificate used by Agaric test sites, go to http://www.cacert.org/index.php?id=3
Go to the Class 3 PKI Key section and click on Intermediate Certificate (PEM Format).
Firefox will then ask what you want to trust.
Background: Firefox not respecting CACert
Secure Connection Failed
mail.agaricdesign.net uses an invalid security certificate.
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