Thunderbird 78.4.3 is out with a handful of fixes

Two Thunderbird releases in a single week; after Thunderbird 78.4.2, released on November 10, 2020, comes Thunderbird 78.4.3. Unlike the first release of the week, this one addresses non-security issues only in Thunderbird, and it raises an interesting question: should bug fixes be released right away or should they be included in the next major release instead, if they are not critical?
Thunderbird 78.4.2 fixed a critical security issue in the email client that affected Firefox as well.
Thunderbird 78.4.3 is already available; users may run a manual check for updates to download and install the update right away. The full installer or a stub installer can be downloaded from the official project website alternatively. It will upgrade existing versions of Thunderbird to the latest release version when executed on a device.
Since it fixes relatively minor issues only, it is an option to skip the update and wait for the next major version of Thunderbird instead. Thunderbird 78.5.0 will come out later this month, and it will include the updates of Thunderbird 78.4.3.
The official release notes lists two issues that have been fixed in the release. The first issue affected users who use the classic Windows 7 theme. These users would see the email subject disappear when they hovered with the mouse cursor over the subject line in the email client.
The second issue affected all Thunderbird users, but only if they switched themes several times. If a user switched from the default theme to the dark theme and then back to the default theme, the user interface would be inconsistent.
Both issues are addressed in the new release, and users who experienced them may want to upgrade right away to get them fixed.
The long-standing issue that the message list is not focused on startup is still present in the latest Thunderbird release.
Now You: Bug fix releases right away, or bundled in one larger release per month, what is your preference?


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!