I'm not support - just a user and still learning but because some people seem to have your issue with firefox and opera, i used IE8 and had no problems. I don't remember the exact process but if i remember correctly, had to export (copy) the certificate first from IE8 to my computer and then import into Thunderbird 3 and CSE saw it then. You may have to email (think the address is in the forum somewhere) Comodo and have them cancel and re-issue you a new certificate.
There is a user guide you can have a looky thru. I posted it in this thread here - https://forums.comodo.com/help-cse/newbie-inquiries-on-cse-and-comodo-dns-on-dialup-connection-t53550.0.html
Thank you for trying to help me.
I really apreciate, very much, your good will
Unhappilly my problems continue to be the same.
However Comodo says that:
“A secure email certificate has already been issued for this email Addess!”,
I just can’ find that certificate on my HD.
I even don’t know which file should I search for.
I put my question on this forum because I tought someone from Comodo would help
This didn’t happen until now…
Maybe later…
I think this problem has happened with other people.