Mozilla and the email client development team Thunderbird released version 78.2.1 on the fixed channel last night. Its existing facilities Thunderbird will be automatically upgraded to the new version, provided that the auto-update feature is not turned off and you have version 78.x.
One of its great new features Thunderbird 78 was PGP encryption support built directly into the application. Its users Thunderbird, previously had to install extensions like Enigmail to have PGP support.
Its release Thunderbird 78 had built-in support for OpenPGP, but was not enabled by default due to some issues that need to be resolved.
Its release Thunderbird 78.2.1 allows OpenPGP support by default on Thunderbird. Select Tools> OpenPGP Key Manager, and you'll see available keys that were previously created or imported, and options for creating new keys that can be used to encrypt your chats via email.
Clicking Generate> New Key Pair starts the process. All you have to do is select one of your available email accounts and click on "create key" to create an encryption key.