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Continuation of my prior post: https://support.mozilla.org/en-US/questions/1516342

Thunderbird has a routine problem with being unable to log into various mail servers. I have four accounts and they all seem to share this problem.

Most recent update: I've tested this in Windows Safe Mode, and the problem has not appeared. Since I can't do any useful work in Safe Mode, it's hard to give it a thorough test, but so far so good. Also, I have removed AVG antivirus because it was redundant. I have seen no improvement since it was removed.

Can this problem be resolved?

I am setting up Thunderbird on a Win10 machine, and am having a lot of trouble adding accounts that I did not have on the two Win11 machines I have set the same accounts up on.

When adding my 2 GMail accounts, after clicking "Allow" on the OAuth popup the button would go grey the window would stay open and not close, and the account would not be added.

Changing the general.useragent.compatMode.firefox option to TRUE allowed me to progress and finally add those accounts.

I am now having the same trouble with my @hotmail.com account. When I add the account, the dark blue OAuth window pops up, but is completely empty, and there is nothing more I can do.

Things I have tried

• Reverting the above config change
• Checking that cookies and JavaScript are enabled
• Checking there is no saved password
• Used both the Account Hub and the default dialog, with the same effect.

Thanks in advance!

(RU)Вопрос и предложения

Здрасьте дорогие разработчики

у вас есть функция, split-screen. Это круто! сделайте, пожалуйста, чтобы это могло включаться через контекстное меню(правая кнопка мышки), чтобы я навел мышку на ссылку и в контекстной меню выбрал этот пункт. чтобы я не через вкладки это делал, а через контекстное меню.

(EN) Questions and suggestions

Hello, dear developers.

You have a split-screen feature. That's awesome! Please make it accessible through the context menu (right-click), so I can hover over a link and select it from the context menu. So I can do it through the context menu instead of through tabs.

Greetings all

I have been experiencing a strange issue with Thunderbird for the last three months, and it’s quite frustrating.

I use an IMAP/SMTP SSL setup (ports 993/465) with a local server that includes webmail but also supports IMAP and SMTP for email client management. Over the past three years, we never encountered any issues, but since upgrading Thunderbird, this problem has started occurring.

As you can see in the GIF, messages appear and disappear when I switch to another folder and then return. This affects not only the message counter but also the actual messages themselves. At first, I thought it might be an indexing issue, so I tried deleting the *.msf files and the global-messages-db.sqlite file within the account profile, but the result was always the same. I also increased the frequency of checking for new messages to every 10 minutes and changed the maximum number of server connections to cache from 1 to 20, but nothing changed.

No issues with webmail and with other email client.

Do you have any ideas or suggestions?

I can receive mail fine. Cannot send mail on gmx.co.uk acct, but gmx.net works on oauth2. But oauth2 is missing on gmx.co.uk It's just not on the pulldown. I tried a new thunderbird acct for gmx.co.uk but oauth2 is still missing.

My 140 version of Thunderbird froze and I removed it and downloaded 140 afresh but it will not run. I just get a white screen and the settings button will not respond.

I'm running FF v147.2.1 on my iPhone. There is NO translation option in the address bar OR in settings. It was supposed to be introduced in v146. Why is it not available despite having a version that is supposed to have the feature?

I would like to setup Firefox so it checks for updates and installs them during maintenance windows (overnight) and runs the updates as 'system' account.

I tried using the following GPO settings

Application Autoupdate Enabled Background updater Enabled Disable Firefox Studies Enabled Disable Telemetry Enabled Disable Update Disabled Don't Check Default Browser Enabled

This seems to create Schedule tasks in Windows task scheduler, but the tasks are running as previously logged on user accounts. which doesn't help us in this particular environment.

I know we can manually push out the latest version via creating new MCM application pushes but the amount of updates that are coming down is a labor intensive exercise and we don't have the budget for PatchMyPC

Please post any thoughts!

I am using Thunderbird 140.8.0esr (64-bit) on Kubuntu 25.10 multi-monitor configuration. New install, very little customization.

Thunderbird will not retain the window size or position for the main window or messages. I have have tried deleting both the xulstore.json and session.json files (one at a time and both). When I delete the xulstore.json file and restart Thurderbird, it starts maximized. When I set the position manually e.g. to use about 90% of the screen for the main window and about half the width and about 90% of height for a message window and then close Thurderbird I can see the new window size vales written into xulstore.json e.g 2493 x 1362 and 1501 x 1317 "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"2493","height":"1362"} "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"1501","height":"1317"}

When I close and restart thunderbird it reverts to opening in the center of the primary monitor at a smaller size than when I closed it. The values in xulstore.json have changed to 960 x 540 "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"960","height":"540"} "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"960","height":"540"}

I found a similar recent question if this helps with a possible solution: https://support.mozilla.org/en-US/questions/1527783 but I cannot locate the referenced userChrome.css file to see if there might be something similar to try.

I am also using a multi-monitor setup. If I move the Thunderbird window to the second screen and close it, it always re-opens on the primary display at the 940x540 size. Thanks!