Problems with Certificate Manager in Thunderbird using S/MIME

Hi, I have two email accounts in Thunderbird. I want to test S/MIME and send an encrypted message. I have a problem with Certificate Manager. When I have installed 2 email certificates for both accounts, after that I can't import a certificate into People tab of Certificate Manager - nothing

Problems with Certificate Manager in Thunderbird using S/MIME

Hi, I have two email accounts in Thunderbird. I want to test S/MIME and send an encrypted message. I have a problem with Certificate Manager. When I have installed 2 email certificates for both accounts, after that I can't import a certificate into People tab of Certificate Manager - nothing