Import and export certificate in FireFox, transfer certificates in different computers

During your renewing S/MIME authenticate certificate, you can save your certificate
as p12 file with a simple password. You can also export your certificate,
In Firefox:
Select "Tools"->"Options" , then select "Advanced" -> "Encryption" -> "View Certificates", choose the "Your Certificates" tab and locate your client certificate from the list. The certificate will be listed under StartCom. Select the certificate and click on "Backup", choose a name for this backup file, provide a password and save it at a known location.


To restore the certificate in another computer, in FireFox:
Select "Tools"->"Options" , then select "Advanced" -> "Encryption" -> "View Certificates", choose the "Your Certificates" tab and click import with your p12 certificate file location.