To view the installed Certificate, please follow the steps below:
1. Open up Thunderbird (if not already opened).
2. Go to Tools > Account Settings
3. On the left-hand side, click on Security > Manage Certificate and Devices (bottom right-hand side) > Manage Certificate...
4. The Certificate installed should be listed under the Your Certificates tab with the certificate name set as Thawte Consulting (Pty) Ltd. > Thawte Freemail Member
To enable your Certificate for use, please refer to the following solution: SO2498