I don't see any way to use client certs in Mozilla _mailer_.
They do work. You can configure your default client cert for SSL under edit/preferences/privacy & security/certificates . Set either "select automatically" or "ask every time". Admittedly, there is no specific setting of the client cert to use to login to each web site. In most cases there is no ambiguity and Mozilla & NSS can determine the right cert to use automatically. If not, set "ask every time" and mozilla will present you with a dialog to let you select the client cert you want.
Of course that can only work if you installed your client certs in mozilla previously (eg. from a PKCS#12 import).
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