Thunderbird 78.3.0 and 78.3.1 have been released

MZLA Technologies Corporation has released two new versions of the Thunderbird desktop email client this week. Thunderbird 78.30 was released on September 24, 2020, and Thunderbird 78.3.1 just two days later on September 26, 2020.
Thunderbird installations that have not received either update yet are updated to version 78.3.1 automatically. Users of the email client can select Help > About Thunderbird to check the installed version and run a manual check for updates. The new release is also available as a manual download from the project's website.
Why two versions? A second version is pushed when the previous version has at least one critical issue, be it security or non-security, that has the potential to affect a large number of users. In this case, Thunderbird 78.3.1 fixes a crash that users experienced after Thunderbird was updated to version 78.3.0.
All changes of Thunderbird 78.3.0 are part of the minor update as well. It is a minor release that fixes non-security and security issues for the most part, and includes some improvements next to that.
The official release notes highlight OpenPGP improvements in this release. The decryption performance of large messages has been improvement when OpenPGP is used, and the external key UI is not shown when disabled in the preferences.
Other changes include that the installation of legacy extension has been disabled in that release, that the account setup wizard displays a popup when a server uses a self-signed SSL/TLS certificate, and that the reply-to header now appears under the From header. Lastly, this release includes unspecified improvements to the calendar's sidebar user interface.
As far as fixes are concerned, there are plenty:
- Selecting "Cancel" on the Master Password prompt at startup incorrectly reported corrupted OpenPGP data
- OpenPGP: Creating a new key pair did not automatically select it for use
- Dragging & Dropping recipient pills resulted in lost pills when an error was present
- Spellcheck suggestions were unreadable in dark theme
- Calendar: Multiple password prompts opened
- Linux Distributions: UI was not rendered completely when built without updater
- MailExtensions: browser.folders.delete failed on IMAP folders
Thunderbird 78.3 resolves several security issues, one of which is rated high, the second highest rating after critical. A total of four security issues are fixed in the release, the remaining three have received a rating of moderate each.
The developers list a single known issue: the mailing list is not focused on startup.
Now You: do you use Thunderbird? What is your take on the 78.x version of the email client?


You said that Outlook isn’t your main email client, so which is your main one?
I think its thunderbird
It is Mozilla Thunderbird.
Awesome! This actually solved my problem… what a stupid bug.
If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.
THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!
Solved my issue! 6 years later and this is still problem…
Fantastic. Thank you. Size did the trick.
This solved my Outlook problem, too. Thank you. :)
Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.
You are a god – thank you!
thanks a lot…. work like charm.. :-)
Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers
Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
Thank you
Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)
Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.
I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!
Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007
Great tip! Thanks!
Worked for me, too – thank you!!!
It’s Worked for me, too
thank you very much!
I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!
Thank you so much. Solved!
Considering you published this in 2012, incredible not been debugged by Microsoft.
Thank you again. M
This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.
Thanks.
Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.
Thank you, this worked !!!!
Man, you are a fucking god. Thanks a lot, what an annoying bug!!
Awesome, this post solved the issue. Many thanks!