Why doesn't Firefox 60 support S/MIME? (If it does where is the documentation/settings?))
I got an email in "Outlook/Office 365, OWA) stating "S/MIME isn't currently supported for your browser or platform." I cannot verify this statement because google searches return ancient mozilla links that do not apply. I'm using firefox Quantum 60.1.0esr (64-bit), packaged by redhat on Scientific Linux 6
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See : https://gist.github.com/rmoriz/5945400
Stab in the dark, but maybe you'd like to try this add-on :
https://addons.mozilla.org/en-US/firefox/addon/encrypt-gmail-ciphermail/?src=search