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Firefox repeatedly crashes on my, multiple times a day. I'dc really like to NOT have to change my default browser to Chrome.

What happens is that Firefox freezes, and I get a white bar at the top telling me so. I get a popup box asking if I want to close Firefox or wait for it to respond. Waiting doesn't work, so I always have to close Firefox. When I reopen it, fortunately all m,y open tabs are retained, but it crashes again within minutes or seconds as soon as I click on anything.

There only thing that seems to work is a reboot of my PC. But the respite is short before Firefox crashes again.

I've disabled most plugins, but that hasn't helped. Is there a way to create an event log within Firefox that I can share with someone at Mozilla to help e debug the issue? It's got to be something local rather than Firefox itself; I can't imagine this is happening to most users.

AvailablePageFile: 9994584064 AvailablePhysicalMemory: 6990008320 AvailableVirtualMemory: 138533823639552 BackgroundTaskMode: 0 BuildID: 20250616215311 CPUMicrocodeVersion: 0x64 CrashTime: 1750858075 HeadlessMode: 0 InstallTime: 1750788070 ModuleSignatureInfo: {"Mozilla Corporation":["firefox.exe","xul.dll","gkcodecs.dll","nss3.dll","mozglue.dll","lgpllibs.dll"],"Microsoft Windows Software Compatibility Publisher":["msvcp140.dll","VCRUNTIME140_1.dll","VCRUNTIME140.dll"],"Microsoft Windows":["MpDetours.dll","wsock32.dll","dbgcore.dll","ktmw32.dll","winmm.dll","version.dll","propsys.dll","DWrite.dll","uxtheme.dll","dbghelp.dll","windows.storage.dll","kernel.appcore.dll","ntmarta.dll","CRYPTBASE.dll","msasn1.dll","ntasn1.dll","ncrypt.dll","bcrypt.dll","ucrtbase.dll","crypt32.dll","msvcp_win.dll","win32u.dll","KERNELBASE.dll","gdi32full.dll","WinTypes.dll","bcryptPrimitives.dll","wintrust.dll","shell32.dll","shlwapi.dll","user32.dll","rpcrt4.dll","SHCore.dll","ole32.dll","psapi.dll","kernel32.dll","advapi32.dll","imm32.dll","oleaut32.dll","msvcrt.dll","gdi32.dll","ws2_32.dll","combase.dll","sechost.dll","ntdll.dll"]} ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 820 StartupCrash: 1 StartupTime: 1750858075 SubmittedFrom: Client SystemMemoryUsePercentage: 79 Throttleable: 1 TotalPageFile: 65870069760 TotalPhysicalMemory: 34067255296 TotalVirtualMemory: 140737488224256 UptimeTS: 8.00534 Vendor: Mozilla Version: 140.0 This report also contains technical information about the state of the application when it crashed.

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.

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.

In the last few weeks, Thunderbird seems to crash randomly multiple times per day. Every time it crashes, I get a popup that apparently sends some kind of report to Mozilla as soon as I click the "Quit Thunderbird" button. I am on version 140.1.1esr of Thunderbird on a Windows 11 computer with 32GB of Ram and the latest version of Windows. If anybody knows what might be causing this (since I don't see any error messages), I'd sure appreciate it.

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!

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? 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useragent_locale: en-US This report also contains technical information about the state of the application when it crashed.

Thunderbird causes blue screen in Windows 11. It's very obvious, since it doesn't happen if I don't open Thunderbird and problem normally occurs when I click on almost anything. It normally takes 2-4 reboots before running properly. It makes me nervous!

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

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!!!

I've gone through the various troubleshooting options over the last month or so and Firefox is still crashing constantly for me, even in Troubleshooting mode. The tabs crash when I'm using a Google Doc, YouTube, Discord, doesn't matter the site; I've submitted about 20 crash reports this morning alone and failed to submit several more:

https://crash-stats.mozilla.org/report/index/ced7bd3d-a768-4ada-a473-127fb0250827 https://crash-stats.mozilla.org/report/index/3886acf3-500e-406b-ab03-77b390250827 https://crash-stats.mozilla.org/report/index/bf00f2f0-4d1a-4364-b369-945170250827 https://crash-stats.mozilla.org/report/index/8568b66f-2058-45bd-a5aa-904540250827 https://crash-stats.mozilla.org/report/index/b651d050-ff74-40bd-ae42-1d4230250827 https://crash-stats.mozilla.org/report/index/b5e446ea-ed00-44cd-b68e-61dd80250827 https://crash-stats.mozilla.org/report/index/7febd586-de43-421a-b3c4-87f230250827 https://crash-stats.mozilla.org/report/index/bcc5ba90-f508-4349-aba1-e0baf0250827

Any help on this would be greatly 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).

Heya I just downloaded and supported Thunderbird as i was super excited for a new email client however it won't open at all. The icon bounces for a few minutes and then it crashes and needs a force quit. I attempted to open in troubleshoot mode but it didn't. I've restarted my Mac and still refuses to open. I also have uninstalled and redownloaded Thunderbird. I'm currently running Catalina 10.15.7 on a MacBook Pro (Mid 2015). Any help would be great. Thank you!

Hi, I keep getting the following message when I try to excute Thunderbird on my Windows 11 desktop:

"Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window."

I have gone off to Taskbar and looked for Thuderbird in the list of programs. It does not appear!

I have restarted my desk top, executed Thunderbird abd I get teh same message.

I have deleted Thunderbird from the desktop, shut down the PC. Restarted the PC and downloaded Thunderbird. I still get the same message when I execute it.

What else can I do about this?

Thank you

Hani

Whenever I’m in a tab where I searched something and I click the three dots the app crashes and closes making it impossible to save bookmarks and etc when having a tab open. But when I’m on the home page it works fine. This is only a problem on my iPad since I first installed the app. My iPad is on the newest iOS update and so is Firefox, also have the latest iPad.

Every time I make Firefox full-screen, it immediately crashes and shuts down. I have restarted the computer, uninstalled and reinstalled Firefox, but it still doesn't work.