Thunderbird 78.3.2 has been released on October 7, 2020. The new minor update for the browser includes several non-security fixes as well as a change in the updating behavior of the desktop email client. Thunderbird 78.3.1 was released on September 26, 2020.
The email client's automatic update functionality should pick up the new version right away, but you can run a manual check by selecting Help > About Thunderbird from the menu. If the menubar is not shown, use the Alt-key to display it temporarily. Thunderbird displays the installed version and will query internet servers to retrieve updates.
The developers list a single change and several fixes in the official release notes. The change affects the email client's updating behavior:
Thunderbird will no longer automatically install updates when Preferences tab is opened
It is not a major change, but Thunderbird will postpone the installation of updates for as long as the user has the preferences of the program open. One explanation for the change is that the developers want to give users as much time as needed when using the preferences of the client without disrupting the process.
The release notes list six fixes in total, some of them specific to the Windows operating system. The new version of Thunderbird improves the client's dark mode, high contrast and theme functionality on Windows. The developers addressed a Windows-specific issue that caused the installer to be unreadable if the operating system was in high contrast mode.
Thunderbird 78.3.2 fixes improves the built-in OpenPGP feature further. The new version has improved support for encrypting with subkeys and fixes a display issue that affected encrypted messages with international characters.
The fifth fix restores the address book search functionality, as searching address book lists did not yield any results in the previous version of the email client.
Last but not least, middle-click deletions of recipients has been restored. It is now once again possible to click on any recipient listed in the TO, CC or BCC fields to have them removed immediately.
The developers list a single known issue, and it is not new as it affected previous versions of Thunderbird as well. When Thunderbird is started, the message list is not focused.
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