Once you have downloaded your PFX, make a note of your PFX code that appears in the Trustwave Control Center. This code is necessary to install your Digital ID on your computer.

Enter a password for your Mozilla Security Device. This is not related to the password for your PFX key. This password secures all of your private keys and certificates within Thunderbird (and Firefox).

After you have entered and confirmed your password for the Mozilla Security Device, click OK and then the next box will be titled Password Entry Dialog. Enter your PFX decryption code that is displayed in the Trustwave Control Center. Click OK and the certificate will be installed. Click OK on the Options window.

Thunderbird will ask if you want to use this same certificate to encrypt your e-mail as well. Click OK when it asks you this question.

If you want to sign all of your messages by default, click the "Digtally sign messages (by default)" option underneath the Digital Signing section. You can also click "Required" under the Encryption section, but we recommend that you leave the "Never" option selected. This way, you can select which messages to encrypt later on.

Click OK and your certificate is installed and configured.