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A new version of the email client Thunderbird has been released today. Thunderbird 78.5.0 updates stable versions of the email client to the most recent version. The new version extends MailExtensions support, bug fixes, and security fixes.

The new version is not yet offered via the email client's automatic update functionality nor is it offered as a direct download on the official Thunderbird project website.

You can run a manual check for updates from within the client by selecting Help > About Thunderbird. Thunderbird displays the currently installed version and checks for available updates; these may then be installed if detected.

The new email client version fixes the long-standing issue that prevented the email list from being selected on start; the issue is no longer listed as a known issue in the release notes .

Thunderbird 78.5.0 is a security update first and foremost. It fixes 12 different security issues detected in previous versions of the program. Two security issues received the second-highest severity rating "high", eight a moderate and two a low rating.

One of the security issues rated high addresses memory corruption issues that could potentially be exploited by an attacker. You can check out the entire list of fixed security issues here.

Thunderbird 78.5.0 improves the capabilities of extensions in several ways. The developers of the email client have added support for two new API functions in the new version:

• MailExtensions: "compose_attachments" context added to Menus API
  
• MailExtensions: Menus API now available on displayed messages
  

The program's built-in OpenPGP functionality has received a new option as well. Thunderbird users may now select that the public key is not attached to a signed message.

Thunderbird 78.5.0 includes several non-security fixes. Two of these address issues in the OpenPGP implementation, namely that unverified keys were shown as unavailable in the message security dialog, and that support for inline PGP messages has been improved.

The new chat contact menu item has been fixed as it did not function correctly, and the developers list "various theme and usability improvements" next to that.

Now You: Have you upgraded to the latest version already? What is your impression?
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