View Your Certificates Email Address

Adds a column for displaying the certificates Email address to the "Your Certificates" tab of the Certificate Manager.If you have several certificates installed for different email addresses, certificate manager is nasty: it does not display the email address the certificate is issued for. Well, it does, but only for "Other People`s" certificates, not for "Your Certificates".This add-on puts another column for displaying the certificate`s email address into the "Your Certificates" tab of the Certificate Manager. It`s only some GUI magic, since all the Logic is already implemented in Thunderbird.