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I don't know where to start. Ever since the update to version 154 I've been having one problem after another: switch from Comcast to Yahoo causes problems with THunderbird, slow indexing, arbitrary folders showing up in different email addresses (confuses my account with my wife's' some of that may be problems dealing with gmail issues), lost email folders after attempted repairs. Three months ago there were none of these problems. I have not yet tried switching back to the last updated version of 153, but 154 does seem to have many more problems. I've run troubleshooting.

I am not a computer expert and there is only so much time I can devote to this, but even computer repair services I've called are at a loss and very pessimistic about the ability to repair things. In all the years (over a decade) my wife and I have used Thunderbird, there have never been as many problems as have surfaced in the last two months. Maybe the best that can be done is to hope that updated versions will gradually fix these issues. I will say that my Macbook Air (M2 chip) has far more problems than my iMac (M1 chip). I have checked and rechecked all server settings (smtp and imap). Although more cumbersome, things perhaps work better if I just stick to webmail options.

Latest version of Windows 11 Thunderbird has stopped displaying the message body in the message pane ( right side of the screen) . I have another email client that displays the message body perfectly. It does display the message body of any messages save in a folder but will not display newly received messages in the pane. When I click on the message sometimes I get a white blank screen in the message body display pane. HELP!

In the last month or 2, when I delete an email it does not show in the trash folder. I can wait from 5 minutes to even the next time I reboot my puter to finally see it it trash. Sometimes it sends it to the all mail or important folder instead of trash. And if I delete from there, it still takes tons of time to end up in the trash folder...if it even gets there. This seems to be getting worse by the day. I have clicked repair folder, no change, I have cleared Thunderbird's cache, no change. It's also now taking way too much time to load an email that contains a picture. This happens with at least 3 of these gmails. I'm at a loss here and extremely frustrated and about to change these gmails from imap to pop. win10 and TB is up to date. But it doesn't compact folders as much as it used to either. Any help appreciated

All of a sudden I have to open the program twice for it to run. First time the screen opens but it is just blank and says it is not responding. So I close it and then open it again and it is fine. Anyone know why this is happening?

I'm not sure what to categorize this as, but here goes...

I came in this morning and noticed that my Thunderbird screens are pixelated. The pixelation changes a bit as I move my mouse over the menus and comes/goes when looking in screens like the Filter Rules. The Filter Rules screen is much more heavily affected. I just ran the update to 154.0 and it is still like this. I am viewing it on a laptop screen, not my large external monitor. Firefox is displaying just fine as are other programs I am running.

T-Bird is Freezing (Hang?) from start to freeze was 5 minutes and a few seconds. Have turned off hardware acceleration and now it freezes at just under 5 minutes. Have put on updates. Currently 153.0.1esr (64-bit). I have captured profile, and re-installed and picked up the profile. Still freezes. Turned off AV. Still freezes. I have compressed and "repaired" all folders. Still Freezes. I forced folders to get rid of anything older than 30 days. Still freezes.

I have been running the task manager, and T-Bird in frozen state is only using 4.3% of CPU at most. I do not see any slowdowns for any other program. So this is not a CPU constrained problem. And it certainly is not memory constrained.

All this started within the past month and I think it was after I put on an ESR update (don't remember which one).

I can kill T-Bird and start it and it will get mail if any, and will function for about 5 minutes and then freezes (or hangs). The system is set to fetch mail on start up and then every 27 minutes. I am not using Account hub (and don't know what it does).

One oddity -- This is a W11 Home system, and Mozilla keeps saying it is a W10 system. Could this be the problem? Wife is running a lesser laptop. It is also running T-Bird, but her O/S is a W11 Pro and she is not having this problem.

I've been using TB for years. Lately I can be browsing the Inbox when the contents will disappear and I get a message saying something like no messages found. After about 30 seconds the Inbox is displayed again.

TB never used to do this and it is similar to Firefox refreshing the screen which it also never used to do this.

Also how do I get from the Beta version to the standard version?

Hi,

I'm running the latest version of Thunderbird 140.12.1esr on 15.7.7 (24G720) on an M1 processor.

I'm witnessing Memory leak > Thunderbird who usually use 800MB jumps to Gb up to 60Gb

It makes this version unusable.

Here is a loom of the incident: https://www.loom.com/share/0b8e661b42d64d749d80adfd71fd1e04

+ a screenshot

Anyone can help ?

Best Olivier

Has there been a change to the way that crashhelper.exe behaves in recent releases of Firefox?

If I disable all my browser extensions in the current Firefox v154.0.0 (rel. 18-Aug-2026) and restart my Win 10 ESU laptop then the first time I launch Firefox with a single tab open (i.e, my Firefox Home page with search and 4 rows of shortcuts) I typically see ~ 6 instances of firefox.exe in Task Manager that all disappear as expected when Firefox is closed.

However, if I immediately re-open Firefox I typically see ~ 11 instances of firefox.exe plus an additional process called crashhelper.exe (located in C:\Program Files\Mozilla Firefox) load into memory. On occasion the crashreporter.exe process will also briefly appear in Task Manager and then quickly disappear. All these extra Firefox processes unload from memory as expected when I close Firefox, and if I go to about:crashes or (Help | More Troubleshooting Information | Crash Reports for the Last 3 Days | All Crash Reports) it shows "No crash reports have been submitted" in the past 3 days, so my Firefox browser appears to be working correctly even if crashhelper.exe and crashreporter.exe start running in the background.

NOTE: I can reproduce this behaviour if I prevent Malwarebytes Premium from launching at boot-up (i.e., if Settings | General | Windows Startup | Launch Malwarebytes in the Background When Windows is Started is OFF) and restart my computer, so I don't believe that the appearance of crashhelper.exe (or crashreporter.exe) has anything to do with my Malwarebytes real-time protection.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.7663 * Firefox v154.0.0 * Microsoft Defender v4.18.26070.9-1.1.26070.7 * Malwarebytes Premium v5.6.5.306-163.0.5714 * Macrium Reflect Free v8.0.7783

Hello Folks, We are a team of 15ppl using thunderbird from last few year and it work flolessly in these years but from last 1week i have been facing a serious issue of : INCOMING EMAILS TAKING A LOT OF TIME TO OPEN AND READ, fresh email when received and after clicking it takes a lot of time of open, having a 100mpbs ILL speed, out of 15 / 12 ppl are facing same issue, even after repairing the inbox the issue remains same, mails are getting downloaded very slowly...we are using google imap server for the same, need help to resolve the same...is it the bug in the latest update 153.0.3 (64-bit) Meadow badge

My Thunderbird app takes some minutes to start up. Updates are OK, troubleshooting does not show any failures. Emailing functions well, no problems. There is a new problem: dragging files to my Explorer has stopped to function.

I have a good HPPro "Desc 400 G5 MT"" PC running on Windows 11 (no problems).

Kindly advice actions to take. Do I loose my Address Book in case I uninstall my Thunderbird and Install a new copy of the Programme. Yours - Jarl Jaatinen, Finland

Goodmorning! Since a couple of days, my TH takes ages to download new messages and when I send a message, it takes at least 20 minutes to show in my Sent folder. I downloaded a new TH but the problem remains the same. I have not changed a thing... What can this be? Its enough to make me change the application... I'm on a Macbook M4.

Been using Thunderbird for a number of years but recently the SSD on my laptop became corrupted and I had to buy a new one and install TB and restore my profiles from a backup.

I have two accounts and switch between them with Profile Manager.

The new laptop is an ASUS Vivobook with Win 11 Home and although TB runs ok the first time, if I close the current session and try to open the other account, nothing happens when I click on TB icon on the taskbar. IF I wait for around 5 minutes then it will run

Checked in Task Manager and cant see any instances of TB running, so any thoughts on what's wrong. Does not matter which order I open the accounts.

Why is Thunderbird email for PC and Android suddenly loading and syncing so slow this week...very frustrating. I have a gmail email...gmail site is fine. I've compacted all folder, etc and IMAP server server setting for years.

Hello Folks,

We are a team of around 15 users who have been using Mozilla Thunderbird with Google IMAP for the last few years. Until recently, Thunderbird has been working reliably without any major issues.

However, for approximately the last one week, we have been facing a serious performance issue with incoming emails. Around 12 out of 15 users are experiencing the same problem.

The main issues we are facing are:

Newly received emails take a very long time to download. After clicking on a newly received email, it takes a considerable amount of time to open and display the content. Emails appear to be downloading extremely slowly, even though our internet connection is a 100 Mbps ILL (Internet Leased Line). The issue is affecting multiple users simultaneously, so it does not appear to be limited to a particular user's Thunderbird profile or PC. We have already tried Repair Folder / Repair Inbox, but the issue persists. We are using Google's IMAP servers for our email accounts.

We are currently using Mozilla Thunderbird 153.0.3 (64-bit) – Meadow Badge.

Could this be a known issue or bug in the latest Thunderbird 153.0.3 update, particularly with Google IMAP?

We would appreciate any guidance from the Thunderbird community/support team on how to troubleshoot and resolve this issue. If there are any recommended settings, logs, diagnostics, or Thunderbird configuration changes that we should check, please let us know.

Since this issue is affecting 12 out of 15 users, it is becoming a significant operational problem for our team.

Any help or suggestions would be highly appreciated.

Thank you.

I've done EVERYTHING.

New install of latest version. edited profile to point to saved data on USB external drive DELETED every instance of lock files terminated task numerous times. rebooted 3 times...

What now???

Thunderbird running 70-80% CPU with status bar showing. Once status bar is removed this drops. Have noticed some bug reports mentioned Linux but I'm on Windows 10 ESU (up to date). Updated TB to 153.0.3esr but no improvement. Tried troubleshoot mode but no improvement. Also noticed that emails aren't getting moved to the deleted folder from inbox. Checked today and none had been moved for 3 days. I deleted some of the older ones from 'Deleted' and then it did update.

We are facing issues with Thunderbird mail application.

Incoming emails are not being received in Thunderbird. Thunderbird is running very slowly and frequently becomes unresponsive. Sending and receiving emails is taking a long time. We have already restarted the application and system, but the issue still persists.

Kindly check the mail server settings and Thunderbird configuration from your end and advise on the necessary action to resolve this issue as soon as possible.

Your prompt support will be highly appreciated.