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If there's one thing I can count on, it's that the next version of Thunderbird will be more buggy & unstable that the previous version, and v 140 certainly does not disappoint in that category. It crashes & closes multiple times per day. Any time something else may be using a lot of resources, Thunderbird freezes up and if I click on it, the app crashes & closes. At least the previous just stayed greyed out until it was able to complete the task and didn't crash & close. Great job Mozilla.

Win 11 and Thunderbird 140 not working and I have tried all the things I found on the internet and none of them work. I have tried cleaning my registry and deleted directories and uninstalled thunderbird re-started and it will still not work.

I guess I have to forget thunderbird. It is a shame.

bp-f7b43b48-1330-4328-a36a-2d3f10260127

Firefox has been crashing regularly for a full day now. I have one profile with multiple extensions, and a fresh profile that is meant to test firefox without any. With this new, "clean-slate" profile with none of my extensions installed, I still get repeated crashes. It is getting in the way of my ability to work- it happens even in Troubleshoot mode, even though I could not confirm any hardware issues prior to this.

Will I need to delete the extenstion-filled profile entirely before going forward? Is there an update I need to install, or anything else I should do myself? Should I provide a list of my extensions?

Attached is the Report ID of my latest crash- hopefully it will help.

Thank you!

Since i updated to 144 Thunderbird works well once started for a few minutes and then starts eating memory and in a few minutes it uses all system memory (64GB) and when virtual memory is exhausted it crashes

Now using 145 beta with same problem.

Using google calendar and only one plugin (Clippings for Thunderbird), tried to disable plugins, calendar, hardware acceleration, tried to compact folders, clear cache, clear msf with no success

for some weeks now, Firefox (latest, in Windows) crashes, or says 'not closed properly' and shows (usually) 12 'instances' in Task Manager when only one tab has been opened. I'm not techie, and need clear advice. Can anyone help please? Hugh, UK

I have used TB since Windows XP days, so very familiar with it. Currently using 140.2.0esr on Windows 10.

Two or three days ago TB updated to 140.x and since then, it has been crashing every time I compose a message. Within two minutes at most, the program hangs, the GUI becomes unresponsive, and Process Explorer reports that TB is using 16.79% of the CPU. It stays that way indefinitely.

After a lot of observation (and saving drafts, and restarting TB over and over and over) I have narrowed this down to typing the apostrophe character. Typing a word like "shouldn't" will hang TB, sometimes on the ' character, and sometimes a second or two later which allows a few more letters to be typed. The problem persists with Troubleshooting Mode enabled.

I have changed nothing in TB. At least, nothing I am aware of. Same keyboard as last week.

Yes, I realize that this sounds crazy.

Does anyone have an inkling about what's happening here? Thanks.

Hello, Randomly but frequently enough to be annoying, Firefox freezes my entire laptop. I have windows 11. It freezes so badly that I have to hold down the on/off button until it goes off. I looked it up outside of Firefox help and, per suggestions, turned off the hardware accelerator. That seemed to work for a little while but now it's happening again with greater frequency. There doesn't seem to be any exact situation that causes it which makes it very hard to diagnose. But it's enough that I'm thinking of looking for another browser so any help would be greatly appreciated. Thank you!

This is maddening. A couple of days ago TB started to freeze. I have not added any new add-ons. I don't even have any add-ons. I tried one suggestion of repairing and compacting folders and that did not help. I also tried the accessibility.force_disabled change from 0 to 1. It is still happening. I have to use Task Manager to shut it down because if I right-click and close it tells me that TB is already running but not responding when I try to restart it. It takes 4-5 tries to get it to the point where I can have a few minutes to do anything in the program. If I leave and come back, the mail window is frozen. Help, please! I have been using TB for years and never had this problem!

Hi Mozilla I hav got a problem with Firefox on Kubuntu 24.04.3. Everytime the computer is restarted Firefox crashes the first time it's started. That's not a big problem, starting Firefox again don't take long. But the problems is exceeding. If i start Firefox by clicking a link in a mail in Thunderbird. And Firefox has not yet been started, It crashes, but now it's also invaliding the Task bar on the screen where Firefox was started. Invaliding means that I cannot start apps from that screens taskbar, and the clock has stalled, none of the tools works etc. The only possibility solution I have been able to figure out, is restart (It's like going back to Win 98). Sometimes I am able to start a app from that invalid taskbar. But it's not the one app that i clicked on. Even though I can trigger it via Thunderbird, the invaliding of the taskbar will occur after a while. And I have to restart. I am not sure if this is the right place to post. But Firefox is always involved, but maybe Thunderbird or Ubuntu was the right place? Every time Firefox crashes there is send a crash report to Mozilla, but is has been going on for a while, so i guess that nobody is looking at the crash report. If I use Chromium instead of Firefox I don't see the problem.

Is it a known issue that opening JIRA web pages immediately crashes and closes the Firefox browser on Windows 11. It never happened on Windows 10 however due to Windows 10 end of life we've been forced to upgrade at work. Now this crashes on a key webpage (we're software delevelopers). So we might have to change to Chrome which I really don't want to do. It would be great if you could find any or many crash reports I've filed and fix the issue.

I've copied the crash report info here in case its of use.

AdapterDeviceID: 0x2216 AdapterDriverVersion: 32.0.15.6614 AdapterSubsysID: 0000000c AdapterVendorID: 0x10de AvailablePageFile: 115913166848 AvailablePhysicalMemory: 101009371136 AvailableVirtualMemory: 138522275762176 BackgroundTaskMode: 0 BuildID: 20250918214338 CPUMicrocodeVersion: 0xa20120a ContentSandboxCapable: 1 ContentSandboxLevel: 8 ContentSandboxWin32kState: Win32k Lockdown enabled -- default value is true CrashTime: 1758883843 DOMFissionEnabled: 1 DOMIPCEnabled: 1 EMCheckCompatibility: true EventLoopNestingLevel: 1 GPUProcessLaunchCount: 1 GPUProcessStatus: Running GpuSandboxLevel: 1 HeadlessMode: 0 InstallTime: 1758532709 LastStartupWasCrash: 1 LauncherProcessState: 0 ModuleSignatureInfo: {"Microsoft 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Notes: FP(D10-L1000-W0000100-T01) Has dual GPUs. GPU-#2: AdapterVendorID2: 0x000a, AdapterDeviceID2: 0x000a, AdapterSubsysID2: 0000000c, AdapterDriverVersion2: DWrite? DWrite+ WR? WR+ ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox QuotaManagerStorageIsNetworkResource: 0 RDDProcessStatus: Running ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 388 StartupCacheValid: 0 StartupCrash: 0 StartupTime: 1758883835 SubmittedFrom: Client SystemMemoryUsePercentage: 26 TelemetryEnvironment: 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useragent_locale: en-US This report also contains technical information about the state of the application when it crashed.

We are experiencing an ongoing issue with Firefox that persists even after performing the following troubleshooting steps: - Uninstalled Firefox completely. - Removed all browser add-ons and extensions. - Reinstalled the latest version of Firefox. Despite these steps, the issue still occurs: Browser crashes, pages not loading, extension not working. Additional Information: - Operating System: Windows 11 Pro - Firefox Version: 145.0.1 - Error Message:

We would appreciate guidance on resolving this problem, as standard troubleshooting has not resolved it.

Thank you in advance for your assistance. Kind regards, Edward

Crash submitted, ID = 320cc808-4505-4cba-6e0f-9f2c2955d007 Still happens in troubleshoot mode. Still happens with extensions disabled (Ublock origin, Proton Pass) Started happening since Dec. 5, 2025 System is current with all Debian?Ubuntu updates installed (daily refreshes) Linux Kernel 6.8 on Lenovo Yoga i7 (ca. 2022) with Intel i5 & Intel graphics

I GOT TIRED OF FREQUENT FIREFOX CRASHES (C0000005) IN BOTH THE 64-BIT AND 32-BIT DESKTOP VERSIONS. I HAVE BEEN USING THE 64-BIT VERSION IN WINDOWS 11 (I HAVE A HIGH-END SAGER LAPTOP WITH 32GB RAM. I INSTALLED THE FREQUENT FIREFOX UPDATES BUT THE PROBLEN PERSISTED EVER SINCE VERSIONS 42X WERE RELEASED. I TRIED THE 32-BIT VERSION BUT THE PROBLEM PERSISTED. FINALLED, I TRIED THE DEVELOPER VERSION: NO MORE CRASHES! I READ THE RESPONSES FROM YOUR CLUELESS STAFF TO OTHER CUSTOMERS WITH THE SAME TROUBLE. THIS IS NOT A WINDOWS ERROR; THIS IS A FIREFOX APPLICATION ERROR. MAYBE SOME OF YOUR FIREFOX DEVELOPER CODERS SHOULD ASSIST THE 32-BIT AND 64-BIT DEVELOPERS. OR, DUMP THE VERSION 4X CODE AND BUILD ON THE MORE STABLE 39X CODE. ALSO, DON'T BLAME WINDOWS FOR FIREFOX APPLICATION ERRORS. AND...NEVER SUGGEST A WINDOWS REINSTALL FOR FIREFOX ERRORS!!!

With thunderbird version 140.4.0esr (64-Bit) on Linux functions to print e-mails or pdf documents is no longer working. When trying to print an email or a pdf document thunderbird starts looping and you need to stop thunderbird from outside with a kill command.

A few days ago thunderbird started getting clunky and freezing intermittently for about 30-40 seconds each time. I decided to uninstall it and re-install. Now when I launch TB it freezes and will not load at all. Tried opening in safe mode and that didn't work. I have accessed my profile folder but didn't want to do anything until I asked. Its setup as IMAP and I've used it for years with the same settings and never had any issues. Any help would be appreciated.

I have experienced Mozilla Thunderbird 140 (or higher) esr (64-bit) running under Windows 11 suddenly freezing up during writing e-mails, particularly (but maybe not exclusively) when a file has been attached to that email (before it has been sent). Has anyone else experienced this, and are there any easy fixes? Thx.

When scanning headers and/or reading messages there are long delays with OS pop up saying Thunderbird is unresponsive. It typically happens when downloads and copying are occurring in the background. TB seems to be giving too much priority to the background making everything in the foreground slow and frequently stop completely. When composing a message a typed line does not appear for 20 seconds or more making it difficult to prevent typing errors. I have not had this problem with older versions of TB. My local message store is well over 20 GB. I expect some operations to take awhile but none should slow or stop response to immediate entry. When TB logs into servers and there are network problems input at the keyboard is often ignored completely. To regain control I have to call the task manager and do end process and restart TB. At first I thought this was a problem with one computer. I have several with a mix of several versions of Windows (7,8,10 and 11) with several email addresses and have the same problem in varying degrees with all of them. If this is a setting problem I have no clue how to fix. I have been using TB more than a decade and feel confident about how to do most operations. I'm using version 140.3.0esr (64bit).