Users of the desktop email client Thunderbird who are still running version 68.x of the program will be upgraded to Thunderbird 78.2.2 automatically. The development team of the email client put an update blocker in place to prevent automatic upgrades from Thunderbird 68.x to Thunderbird 78 after the initial release of the new version. One of the main reasons for putting the update block in place was that the extension system changed in Thunderbird 78….
https://www.ghacks.net/2020/09/15/automatic-thunderbird-upgrade-to-version-78-x-has-started/