After the preparations described in an earlier post, we've shipped Betterbird 140.3.1esr-bb12 today. Please refer to the Release Notes for the full details.
This release contains a lot of fixes for issues raised by our users in the last two weeks. The upstream Thunderbird release 140.3.1 also contains more fixes than usual. Six of those fixes had already shipped in Betterbird earlier.
Update a few hours later: There is no release without some sort of issue. We just got a report that native new mail alerts, so not system alerts, are displayed at the right corner of the right monitor in a dual-monitor when before they are displayed at the right corner of the left monitor.
Here's what happened: As stated in the Release Notes, we tried to mitigate random flashing of Betterbird-native new mail alert in top left corner of the screen. So after creating the window, we now move it "off-screen", but it may end up on a monitor to the right and finally at its corner. A picture says more than 1000 words:
Some users may work around the issue by setting the preference mail.notification.show_on_app_screen. If you're affected, please let us know and we'll provide a solution.
Or you can try the latest build for Windows in English. Yes, how ironic, a "latest build" on the day of the release.