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Solution ID : SO4292

Last Modified : 06/21/2018

How to import a personal certificate into Mozilla Thunderbird


How to install a personal certificate into Mozilla Thunderbird.


Before proceeding to install certificates in Thunderbird, please ensure that the root and intermediate certificates are installed into thunderbird using the following article: 


ECA Certificates:  SO10186

  • Use the Firefox section
  • Right click on the account you wish to send signed emails from and click Settings > Security > View Certificates > Authorities tab
  • Complete steps 4 through 6 in the Firefox section of the linked article

Digital ID Certificates for Secure Email (Class 1): SO6395


After you have imported the certificate in Mozilla Firefox, you need to export it from Mozilla Firefox, and import it into Mozilla Thunderbird and thereafter enable Mozilla Thunderbird with the certificate.

Firefox (browser) and Thunderbird (email client) do not use the same profile and are not in any way linked to one another.   Requesting, downloading and installing a Certificate in Firefox, will not automatically display in Thunderbird.  You will need to export the Certificate from Firefox.  Please see the following solution for instructions to export the certificate: SO4291
After you have exported the certificate from Firefox, you will need to import and enable the certificate on Thunderbird.  
Step 1:  Import personal certificate (For Secure Email) for Mozilla Thunderbird
1.  Open up Mozilla Thunderbird
2.  Select Tools > Account Settings > Security
3.  On the right-hand side, click Manage Certificate and Devices > click Manage Certificates
Depending on the version of Thunderbird you're using you might see a Certificates section instead.  If so, click View Certificates
4.  Under Your Certificates tab, click Import
5.  Select the PCKS12 certificate file (.pfx or .p12).
6.  When prompted, enter the Master Password for the Software Security Device
Note:  The master password was set when your profile was originally created on Firebird.  Click OK
7.  Enter the Certificate backup password
8.  Click OK

Once imported, you will receive the following message: Successfully restored your security certificate(s) and private key(s)

Step 2:  Enable personal certificate (For Secure Email) for Mozilla Thunderbird

1.  Select Tools > Account Settings
2.  On the left-hand side, click Security > under Digital Signing > Select... Select your Certificate from the list displayed
3.  Make sure to select Digitally sign messages (by default)
4.  Under Encryption > Select... Select your Certificate from the list displayed


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