Thunderbird Community Forum

I run Thunderbird on MacOS for some years without a problem. Now, after a hard reboot, Thunderbird won't launch anymore. I tried reinstalling to no avail. Is there anything I could do here? Or do you need any more info? The crash report is as follows:

Translated Report (Full Report Below)

Process: thunderbird [8297] Path: /Applications/Thunderbird.app/Contents/MacOS/thunderbird Identifier: org.mozilla.thunderbird Version: 155.0 (15526.8.28) Code Type: X86-64 (Native) Parent Process: launchd [1] User ID: 501

Date/Time: 2026-09-09 13:49:46.3562 +0200 OS Version: macOS 15.0.1 (24A348) Report Version: 12 Anonymous UUID: A83FED70-635C-4178-5B0E-2FB36A313750

Sleep/Wake UUID: 9CEF8430-EEF8-43BB-AC16-8A9FF7407F51

Time Awake Since Boot: 25000 seconds Time Since Wake: 7284 seconds

System Integrity Protection: enabled

Crashed Thread: 0 MainThread Dispatch queue: com.apple.main-thread

Exception Type: EXC_GUARD (SIGKILL) Exception Codes: GUARD_TYPE_MACH_PORT Exception Codes: 0x0000000000000203, 0x0000000000000000

Termination Reason: Namespace GUARD, Code 2305843146652647939

Thread 0 Crashed:: MainThread Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x7ff815680e0e mach_msg2_trap + 10 1 libsystem_kernel.dylib 0x7ff81568f622 mach_msg2_internal + 84 2 libsystem_kernel.dylib 0x7ff815687f16 mach_msg_overwrite + 649 3 libsystem_kernel.dylib 0x7ff8156810ff mach_msg + 19 4 XUL 0x2f9aca7f4 0x2f35dd000 + 105830388 5 XUL 0x2f9ac4183 0x2f35dd000 + 105804163 6 XUL 0x2f9ac2884 0x2f35dd000 + 105797764 7 XUL 0x2f865b45b 0x2f35dd000 + 84403291 8 XUL 0x2f8685615 0x2f35dd000 + 84575765 9 XUL 0x2f868d2af 0x2f35dd000 + 84607663 10 XUL 0x2f868d80f 0x2f35dd000 + 84609039 11 thunderbird 0x10d03ab2a 0x10d03a000 + 2858 12 dyld 0x7ff8153342cd start + 1805

Thread 1:: AsyncSignalControlThread 0 libsystem_kernel.dylib 0x7ff81568187a read + 10 1 XUL 0x2f825612a 0x2f35dd000 + 80187690 2 XUL 0x2f82560dd 0x2f35dd000 + 80187613 3 libsystem_pthread.dylib 0x7ff8156c2253 _pthread_start + 99 4 libsystem_pthread.dylib 0x7ff8156bdbef thread_start + 15

Thread 2:: RegisterFonts 0 CoreFoundation 0x7ff81573a759 CFStringGetCharacters + 98 1 CoreFoundation 0x7ff815803d71 CFURLCreateFilePathURL + 1086 2 libFontRegistry.dylib 0x7ff81e9c2201 TLocalFontRegistryImp::RegisterFont(__CFURL const*, __CFDictionary const*, unsigned int, unsigned int, __CFError**) const + 459 3 libFontRegistry.dylib 0x7ff81e9c2c32 TLocalFontRegistryImp::RegisterFonts(__CFArray const*, __CFDictionary const*, unsigned int, unsigned int, __CFArray const**, __CFArray const**, __CFArray const**) const + 182 4 libFontRegistry.dylib 0x7ff81e9de0ff XTRegisterFonts2 + 701 5 CoreText 0x7ff817d6db29 _CTFontManagerRegisterActionFontsForURLs(__CFArray const*, CTFontManagerScope, bool, Action, __CFArray const**) + 339 6 CoreText 0x7ff817d6eef7 _CTFontManagerRegisterActionFontURLs(__CFArray const*, CTFontManagerScope, bool, Action, URLTrust, __CFArray const*, bool (__CFArray const*, bool) block_pointer) + 42 7 XUL 0x2f4b40609 0x2f35dd000 + 22427145 8 XUL 0x2f4b5deba 0x2f35dd000 + 22548154 9 libnss3.dylib 0x2da8bb369 0x2da709000 + 1778537 10 libsystem_pthread.dylib 0x7ff8156c2253 _pthread_start + 99 11 libsystem_pthread.dylib 0x7ff8156bdbef thread_start + 15

Thread 3: 0 libsystem_pthread.dylib 0x7ff8156bdbcc start_wqthread + 0

Thread 4: 0 libsystem_kernel.dylib 0x7ff815680e0e mach_msg2_trap + 10 1 libsystem_kernel.dylib 0x7ff81568f622 mach_msg2_internal + 84 2 libsystem_kernel.dylib 0x7ff815687f16 mach_msg_overwrite + 649 3 libsystem_kernel.dylib 0x7ff8156810ff mach_msg + 19 4 XUL 0x2f9aca16d 0x2f35dd000 + 105828717 5 XUL 0x2f9acaeac 0x2f35dd000 + 105832108 6 XUL 0x2f9acad91 0x2f35dd000 + 105831825 7 XUL 0x2fb206fa9 0x2f35dd000 + 130195369 8 libsystem_pthread.dylib 0x7ff8156c2253 _pthread_start + 99 9 libsystem_pthread.dylib 0x7ff8156bdbef thread_start + 15

Thread 5: 0 libsystem_pthread.dylib 0x7ff8156bdbcc start_wqthread + 0

Thread 0 crashed with X86 Thread State (64-bit):

 rax: 0x000000001000000a  rbx: 0x00000002db928340  rcx: 0x00007ff7b2ec4af8  rdx: 0x0000003480000013
 rdi: 0x00000002db928340  rsi: 0x0000000400000011  rbp: 0x00007ff7b2ec4b60  rsp: 0x00007ff7b2ec4af8
  r8: 0x0000000000000000   r9: 0x0000000000000001  r10: 0x0000000000002303  r11: 0x0000000000000206
 r12: 0x00000000000007d0  r13: 0x0000000400000011  r14: 0x0000000000000000  r15: 0x0000000000000001
 rip: 0x00007ff815680e0e  rfl: 0x0000000000000206  cr2: 0x0000000000000000
 

Logical CPU: 0 Error Code: 0x0100002f Trap Number: 133

Binary Images:

      0x10d03a000 -        0x10d042fff org.mozilla.thunderbird (155.0) <4c4c4439-5555-3144-a100-2f79b5ba51e1> /Applications/Thunderbird.app/Contents/MacOS/thunderbird
      0x10d168000 -        0x10d1dcfff libmozglue.dylib (*) <4c4c4442-5555-3144-a1b2-7d8d2d6587df> /Applications/Thunderbird.app/Contents/MacOS/libmozglue.dylib
      0x10d077000 -        0x10d083fff com.apple.CoreWiFi (1.0) <c356ba94-c112-3326-9011-74fc0bb4dfde> /System/Library/PrivateFrameworks/CoreWiFi.framework/Versions/A/CoreWiFi
      0x10d444000 -        0x10d5dffff CoreWiFiOld.dylib (*) <d5ce0007-36ac-37a1-a5d7-07ad7365e60a> /System/Library/PrivateFrameworks/CoreWiFi.framework/Versions/A/CoreWiFiOld.dylib
      0x10d056000 -        0x10d057fff com.apple.IO80211 (1.0) <c0791260-3db4-30e8-962c-1d7a90bbe2d5> /System/Library/PrivateFrameworks/IO80211.framework/Versions/A/IO80211
      0x10d061000 -        0x10d061fff com.apple.WiFiPeerToPeer (652.55.0) <6de18c87-b584-3fba-b9f2-5439ee94f3f7> /System/Library/PrivateFrameworks/WiFiPeerToPeer.framework/Versions/A/WiFiPeerToPeer
      0x17689e000 -        0x1768f1fff IO80211Old.dylib (*) <d5ce0007-f5f4-3ab8-a256-05df5202823b> /System/Library/PrivateFrameworks/IO80211.framework/Versions/A/IO80211Old.dylib
      0x1e640b000 -        0x1e6432fff WiFiPeerToPeerOld.dylib (*) <d5ce0007-9684-3a09-bf78-fb3a4f8bb7b1> /System/Library/PrivateFrameworks/WiFiPeerToPeer.framework/Versions/A/WiFiPeerToPeerOld.dylib
      0x2da709000 -        0x2da9d5fff libnss3.dylib (*) <4c4c449b-5555-3144-a1ce-153a9242e9fd> /Applications/Thunderbird.app/Contents/MacOS/libnss3.dylib
      0x2dbc97000 -        0x2dc767fff libgkcodecs.dylib (*) <4c4c4478-5555-3144-a176-a5710479f9c6> /Applications/Thunderbird.app/Contents/MacOS/libgkcodecs.dylib
      0x10d400000 -        0x10d423fff liblgpllibs.dylib (*) <4c4c44b4-5555-3144-a1b9-b5c664969bb6> /Applications/Thunderbird.app/Contents/MacOS/liblgpllibs.dylib
      0x10d06b000 -        0x10d06bfff com.apple.framework.CoreWLAN (16.0) <cf40012c-37ff-356e-863f-24c150978974> /System/Library/Frameworks/CoreWLAN.framework/Versions/A/CoreWLAN
      0x25d475000 -        0x25d4effff CoreWLANOld.dylib (*) <d5ce0007-0117-3ddb-beb8-5886a5f8b758> /System/Library/Frameworks/CoreWLAN.framework/Versions/A/CoreWLANOld.dylib
      0x2f35dd000 -        0x2fe8e2fff XUL (*) <4c4c44ee-5555-3144-a15b-7a3b6ab61736> /Applications/Thunderbird.app/Contents/MacOS/XUL
      0x10d42f000 -        0x10d430fff org.mozilla.channelprefs (1.0) <4c4c4410-5555-3144-a148-95c735c87f29> /Applications/Thunderbird.app/Contents/Frameworks/ChannelPrefs.framework/ChannelPrefs
   0x7ff815680000 -     0x7ff8156bbfff libsystem_kernel.dylib (*) <10094a6c-fa57-367f-b06e-7c449ea31285> /usr/lib/system/libsystem_kernel.dylib
   0x7ff81532e000 -     0x7ff8153ba32f dyld (*) <69c73748-37ae-3a6f-83af-690645c3da75> /usr/lib/dyld
              0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
   0x7ff8156bc000 -     0x7ff8156c7fff libsystem_pthread.dylib (*) <c0db9cf9-86ec-31d4-a557-2c07945fd8f2> /usr/lib/system/libsystem_pthread.dylib
   0x7ff81572b000 -     0x7ff815bcaff2 com.apple.CoreFoundation (6.9) <541c6f06-0abc-39f5-a7d2-3cad5db19c04> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
   0x7ff81e9af000 -     0x7ff81e9faff7 libFontRegistry.dylib (*) <31b7fceb-b146-3e8d-a297-87c67730f388> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
   0x7ff817c31000 -     0x7ff817e51ff5 com.apple.CoreText (841.0.0.1) <c3eb23cc-fc68-312e-bc9d-8e28a4a44da3> /System/Library/Frameworks/CoreText.framework/Versions/A/CoreText

External Modification Summary:

 Calls made by other processes targeting this process:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0
 Calls made by this process:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0
 Calls made by all processes on this machine:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0

VM Region Summary: ReadOnly portion of Libraries: Total=1.3G resident=0K(0%) swapped_out_or_unallocated=1.3G(100%) Writable regions: Total=7.6G written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=7.6G(100%)

                               VIRTUAL   REGION 

REGION TYPE SIZE COUNT (non-coalesced)

===== ======= =

Activity Tracing 256K 1 Kernel Alloc Once 8K 1 MALLOC 550.1M 21 MALLOC guard page 24K 6 STACK GUARD 56.0M 6 Stack 12.0M 6 VM_ALLOCATE 132.0M 18 VM_ALLOCATE (reserved) 7.1G 10 reserved VM address space (unallocated) __CTF 824 1 __DATA 30.4M 877 __DATA_CONST 95.2M 881 __DATA_DIRTY 2560K 333 __FONT_DATA 2352 1 __INFO_FILTER 8 1 __LINKEDIT 186.2M 17 __OBJC_RO 76.1M 1 __OBJC_RW 2354K 2 __TEXT 1.1G 902 __TPRO_CONST 272K 2 dsce.got 124K 1 dyld private memory 512K 2 mapped file 53.2M 51 owned unmapped memory 20K 1 shared memory 1124K 9

===== ======= =

TOTAL 9.4G 3151 TOTAL, minus reserved VM space 2.3G 3151

Full Report

{"app_name":"thunderbird","timestamp":"2026-09-09 13:49:48.00 +0200","app_version":"155.0","sroute_id":12,"slice_uuid":"4c4c4439-5555-3144-a100-2f79b5ba51e1","build_version":"15526.8.28","platform":1,"bundleID":"org.mozilla.thunderbird","share_with_app_devs":0,"is_first_party":0,"bug_type":"309","os_version":"macOS 15.0.1 (24A348)","roots_installed":0,"name":"thunderbird","incident_id":"D8368554-B699-4AD8-A8A6-2C4175E89A69"} {

 "uptime" : 25000,
 "procRole" : "Background",
 "version" : 2,
 "userID" : 501,
 "deployVersion" : 210,
 "modelCode" : "MacBookPro15,2",
 "coalitionID" : 1356,
 "osVersion" : {
   "train" : "macOS 15.0.1",
   "build" : "24A348",
   "releaseType" : "User"
 },
 "captureTime" : "2026-09-09 13:49:46.3562 +0200",
 "codeSigningMonitor" : 0,
 "incident" : "D8368554-B699-4AD8-A8A6-2C4175E89A69",
 "pid" : 8297,
 "cpuType" : "X86-64",
 "roots_installed" : 0,
 "bug_type" : "309",
 "procLaunch" : "2026-09-09 13:49:45.0052 +0200",
 "procStartAbsTime" : 25995372141555,
 "procExitAbsTime" : 25996722299153,
 "procName" : "thunderbird",
 "procPath" : "\/Applications\/Thunderbird.app\/Contents\/MacOS\/thunderbird",
 "bundleInfo" : {"CFBundleShortVersionString":"155.0","CFBundleVersion":"15526.8.28","CFBundleIdentifier":"org.mozilla.thunderbird"},
 "storeInfo" : {"deviceIdentifierForVendor":"1F778C59-C2BF-597B-B4D7-068A27420DA1","thirdParty":true},
 "parentProc" : "launchd",
 "parentPid" : 1,
 "coalitionName" : "org.mozilla.thunderbird",
 "crashReporterKey" : "A83FED70-635C-4178-5B0E-2FB36A313750",
 "codeSigningID" : "org.mozilla.thunderbird",
 "codeSigningTeamID" : "",
 "codeSigningFlags" : 570490881,
 "codeSigningValidationCategory" : 1,
 "codeSigningTrustLevel" : 4294967295,
 "bootSessionUUID" : "3B94A2DF-4DD0-4B72-9BCF-22A7621B9373",
 "wakeTime" : 7284,
 "sleepWakeUUID" : "9CEF8430-EEF8-43BB-AC16-8A9FF7407F51",
 "sip" : "enabled",
 "sroute_id" : 12,
 "exception" : {"port":515,"signal":"SIGKILL","guardId":0,"codes":"0x0000000000000203, 0x0000000000000000","violations":["ILLEGAL_MOVE"],"message":" ILLEGAL_MOVE on mach port 515 (guarded with 0x0000000000000000)","subtype":"GUARD_TYPE_MACH_PORT","type":"EXC_GUARD","rawCodes":[515,0]},
 "termination" : {"namespace":"GUARD","flags":2,"code":2305843146652647939},
 "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
 "faultingThread" : 0,
 "threads" : 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 "usedImages" : [
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   "source" : "P",
   "arch" : "x86_64",
   "base" : 4513308672,
   "CFBundleShortVersionString" : "155.0",
   "CFBundleIdentifier" : "org.mozilla.thunderbird",
   "size" : 36864,
   "uuid" : "4c4c4439-5555-3144-a100-2f79b5ba51e1",
   "path" : "\/Applications\/Thunderbird.app\/Contents\/MacOS\/thunderbird",
   "name" : "thunderbird",
   "CFBundleVersion" : "15526.8.28"
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   "source" : "P",
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   "arch" : "x86_64",
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Model: MacBookPro15,2, BootROM 2022.100.22.0.0, 4 processors, Quad-Core Intel Core i7, 2,11 GHz, 32 GB, SMC Graphics: Intel HD Graphics 620, Intel HD Graphics 620, Built-In Display: Unknown Display, 2048 x 1152, Main, MirrorOff, Online Memory Module: BANK 0/ChannelA-DIMM0, 16 GB, DDR4, 2400 MHz, SK Hynix, HMA82GS6AFR8N-UH Memory Module: BANK 2/ChannelB-DIMM0, 16 GB, DDR4, 2400 MHz, SK Hynix, HMA82GS6AFR8N-UH AirPort: spairport_wireless_card_type_wifi (0x14E4, 0x117), Broadcom BCM43xx 1.0 (7.77.111.1 AirPortDriverBrcmNIC-1772.1) AirPort: Bluetooth: Version (null), 0 services, 0 devices, 0 incoming serial ports Network Service: Wi-Fi, AirPort, en1 PCI Card: Intel HD Graphics 620, VGA compatible controller, Internal@0,2,0 PCI Card: Sunrise Point-LP HD Audio, Audio device, Internal@0,31,3 USB Device: USB30Bus USB Device: USB3.0-CRW USB Device: vendor_device USB Device: Integrated Camera USB Device: BRCM20702 Hub USB Device: Bluetooth USB Host Controller Thunderbolt Bus:

Whilst using TB the screen went white with dozens of little tabs along the top of the screeen with what look like page icons, as the app became 'not responding'. Re-loading didn't help - same screen. Re-starting didn't help. I uninstalled and re-installed TB but it is stil the same. Opening in Windows (11) safe mode produced virtually the same result except for a few seconds I was able to open the hamburger menu and select trouble shooting. Opened in trouble shooting mode showed several alerts of 'failed to connect with servers' (outlook.office365.com imap.gmail.com and Yahoo). Then it shut down as before 'not responding'. When open, TB is using some 80% of available memory., and I can only close it by using Task Manager. I'm a complete dunce at this stuff so, if anyone knows a way out of this hole, please use simple English! Thanks, Jeff

I have followed all the other recommendations with, no luck. I am on Windows 11 and use Eset virus software. Thunderbird is not listed as running it Task Manager, and there is no Profile.lock (think that was what it was called) in the profile directory, and I have deleted the existing profiles and recreated it. I have uninstalled and reinstall Thunderbird, and I have rebooted my computer. I am frustrated and concerned I will loose saved emails and my address book! Help.

I have just re-started my problem when this system crashes again. For 3 weeks I have sent reports of sites being crashed. The has not been any changes. It happens when on web site and also when using E-mail. HELP!

Hello -- I'm hoping someone will be able to help!

I'm running Thunderbird 140.9.1esr (32-bit) on Windows 10 Pro version 22H2 (OS Build 19045.6466) with an Intel Core i7 processor.

Thunderbird suddenly started crashing repeatedly since yesterday. It ran long enough for me to install version 140.9.1esr, but still crashes repeatedly within a couple minutes of running the application, even if I don't do anything such as trying to reply to a message.

Please see below what I get in the Windows Event Viewer, pretty much the same for each crash. I have also pasted the contents of the following file (the others mentioned above don't exist).

C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppHang_thunderbird.exe_5d8d3f9d863d0b28eacbd2a393cdc3d04ef559_c250478b_deffcb88-26f8-4204-bffd-7e6fd5a2ea88

I've gone to Troubleshooting Information, I've "cleared startup cache", I've tired "Troubleshoot Mode" and still Thunderbird crashes. There's nothing in Crash Reports.

Any help would be truly appreciated!

Best regards,

Miles Montelius

==========

The program thunderbird.exe version 140.9.1.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel.

Process ID: 2fe4
Start Time: 01dcc9b06a74fe27
Termination Time: 19
Application Path: C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe
Report Id: 1f27bed4-950e-4cf2-b2be-0e17b3c5bff0
Faulting package full name: 
Faulting package-relative application ID: 
Hang type: Unknown

===========

Fault bucket 2206417569010378635, type 5 Event Name: AppHangB1 Response: Not available Cab Id: 0

Problem signature: P1: thunderbird.exe P2: 140.9.1.0 P3: 69d0a82a P4: aa1e P5: 134217728 P6: P7: P8: P9: P10:

Attached files: \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1ECA.tmp.WERInternalMetadata.xml \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1EDB.tmp.xml \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1EE9.tmp.csv \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1F19.tmp.txt \\?\C:\Users\Miles\AppData\Local\Temp\WER2554.tmp.appcompat.txt

These files may be available here: \\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppHang_thunderbird.exe_5d8d3f9d863d0b28eacbd2a393cdc3d04ef559_c250478b_deffcb88-26f8-4204-bffd-7e6fd5a2ea88

Analysis symbol: Rechecking for solution: 0 Report Id: 1f27bed4-950e-4cf2-b2be-0e17b3c5bff0 Report Status: 268435456 Hashed bucket: 6bb25f0f2ae99d39de9ec516c30b678b Cab Guid: 0

================================= Report.wer

Version=1 EventType=AppHangB1 EventTime=134203853995104936 ReportType=3 Consent=1 UploadTime=134203854012764044 ReportStatus=268435456 ReportIdentifier=deffcb88-26f8-4204-bffd-7e6fd5a2ea88 IntegratorReportIdentifier=1f27bed4-950e-4cf2-b2be-0e17b3c5bff0 Wow64Host=34404 Wow64Guest=332 NsAppName=thunderbird.exe OriginalFilename=thunderbird.exe AppSessionGuid=00002fe4-0001-0089-27fe-746ab0c9dc01 TargetAppId=W:00069140475b22fa6eb7e8a09288ccaa9eed00000000!0000296d4ceec558ce2477919ca1d55d16c4eb0ece48!thunderbird.exe TargetAppVer=2026//04//04:05:56:58!6df25!thunderbird.exe BootId=4294967295 TargetAsId=1039 IsFatal=1 EtwNonCollectReason=1 Response.BucketId=6bb25f0f2ae99d39de9ec516c30b678b Response.BucketTable=5 Response.LegacyBucketId=2206417569010378635 Response.type=4 Sig[0].Name=Application Name Sig[0].Value=thunderbird.exe Sig[1].Name=Application Version Sig[1].Value=140.9.1.0 Sig[2].Name=Application Timestamp Sig[2].Value=69d0a82a Sig[3].Name=Hang Signature Sig[3].Value=aa1e Sig[4].Name=Hang Type Sig[4].Value=134217728 DynamicSig[1].Name=OS Version DynamicSig[1].Value=10.0.19045.2.0.0.256.48 DynamicSig[2].Name=Locale ID DynamicSig[2].Value=2057 DynamicSig[22].Name=Additional Hang Signature 1 DynamicSig[22].Value=aa1ee6b70f5730e6b2c3407f0286853a DynamicSig[23].Name=Additional Hang Signature 2 DynamicSig[23].Value=d531 DynamicSig[24].Name=Additional Hang Signature 3 DynamicSig[24].Value=d5313f546285bab3fbd31e098595851c DynamicSig[25].Name=Additional Hang Signature 4 DynamicSig[25].Value=aa1e DynamicSig[26].Name=Additional Hang Signature 5 DynamicSig[26].Value=aa1ee6b70f5730e6b2c3407f0286853a DynamicSig[27].Name=Additional Hang Signature 6 DynamicSig[27].Value=d531 DynamicSig[28].Name=Additional Hang Signature 7 DynamicSig[28].Value=d5313f546285bab3fbd31e098595851c UI[3]=Thunderbird is not responding UI[4]=If you close the program, you might lose information. 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LoadedModule[129]=C:\WINDOWS\SYSTEM32\d3d9.dll LoadedModule[130]=C:\Program Files (x86)\Mozilla Thunderbird\libEGL.dll LoadedModule[131]=C:\WINDOWS\SYSTEM32\cryptnet.dll LoadedModule[132]=C:\WINDOWS\SYSTEM32\drvstore.dll LoadedModule[133]=C:\WINDOWS\System32\imagehlp.dll LoadedModule[134]=C:\WINDOWS\system32\rsaenh.dll LoadedModule[135]=C:\WINDOWS\SYSTEM32\dxcore.dll LoadedModule[136]=C:\WINDOWS\SYSTEM32\resourcepolicyclient.dll State[0].Key=Transport.DoneStage1 State[0].Value=1 OsInfo[0].Key=vermaj OsInfo[0].Value=10 OsInfo[1].Key=vermin OsInfo[1].Value=0 OsInfo[2].Key=verbld OsInfo[2].Value=19045 OsInfo[3].Key=ubr OsInfo[3].Value=6466 OsInfo[4].Key=versp OsInfo[4].Value=0 OsInfo[5].Key=arch OsInfo[5].Value=9 OsInfo[6].Key=lcid OsInfo[6].Value=2057 OsInfo[7].Key=geoid OsInfo[7].Value=242 OsInfo[8].Key=sku OsInfo[8].Value=48 OsInfo[9].Key=domain OsInfo[9].Value=0 OsInfo[10].Key=prodsuite OsInfo[10].Value=256 OsInfo[11].Key=ntprodtype OsInfo[11].Value=1 OsInfo[12].Key=platid 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OsInfo[34].Key=fconid OsInfo[35].Key=containerid OsInfo[36].Key=containertype OsInfo[37].Key=edu OsInfo[37].Value=0 FriendlyEventName=Stopped responding and was closed ConsentKey=AppHangXProcB1 AppName=Thunderbird AppPath=C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe ReportDescription=A problem caused this program to stop interacting with Windows. NsPartner=windows NsGroup=windows8 ApplicationIdentity=BD651D92C43397BE7A26BAF48837601A MetadataHash=-60511867

After I open my Thunderbird email and use it for 15 to 20 minutes it freezes. I need to close it and I get a message Thunderbird is not responding. I then need to close the program using Microsoft to close the program.

After a reboot and Windows 11 update today, Thunderbird (I believe it was v155) will not open. It asks for the password, then sits at [Not Responding].

I have copied my profiles (there are two, one dated 2023 with only a 1K .json file in it, and one created tonight while I was troubleshooting that's several GB and when copying, appears to contain all my mail folders although I can't access them directly from within the profile) to a separate location (my desktop).

I've tried the following (after checking previous questions here in Mozilla support):

(1) booting Windows into safe mode

(2) opening Thunderbird in Troubleshooting mode (Shift while opening), both in Windows safe mode and normal boot

(3) uninstalled Thunderbird from Control Panel, downloaded and installed a new copy of Thunderbird

All give the same result: "not responding", can't click anything. Can only wait or close.

I was able to disable an extension that I installed yesterday that had been working fine.

I'm also wondering if the problem is mail folders that are too large. I have some candidates for deletion but since I can't see any .msf files for them, I can't delete (because I can't open Thunderbird.

I'm leery of instructions to outright delete any Thunderbird folders/files because (1) I can't see my mail folders directly and (2) I'm self-employed and all my client and business emails are in there. Losing them woud be a disaster.

I'm tempted to try the Windows option of restoring my entire computer to an earlier point, say, this morning. But that seems like possible overkill if it's an issue with just Thunderbird.

I'm freaking out, please help!

For two days I'm having intermittent "hanging" when I'm typing a document or letter in Thunderbird. It has just dont that for the 2nd time in less than 10 minutes. Don't know what's happening but it's very frustrating. Am not having any other computer problems. Am running Windows 11 which is automatically updated by Windows. I think Thunderbird is the most current version too. Help please anyone! It does say "(Not Responding) at the very top of the page.

When starting thunderbird, the program cannot find my e-mails and does not respond. It is frozen. deinstallation and new installation did not help. The version i do not know because I cannot open the menue.

Mozilla Thunderbird stopped responding, tried to shut down, restart, uninstall and install - nothing helps Still opens the window, but no messages white backgoround and (Not Responding)

My machine Intel i3 6100, 16g of ddr4, windows 10. 250 gb ssd +1 tb mech hard drive

Over the last week or so, I call up Thunderbird then when I click on anything, it just comes back "Not responding" Any ideas?

Thanks in advance Tony Sneath

I posted this earlier and the bot named David is trying to take over with ideas that don’t work. How do we stop it? I also posted from my own email and it tried to stop me.

Hi, I have been a Thunderbird user for many years and have over 16,000 emails in my account.

Today when I launched TB it comes up with blank screen with No Response on the top left. See screen shot image upload.

I have tried launching with Thunderbird -P and it only shows default account named default.

- other places show 3 accounts with one having -release

--Users\myuserID\local\Thunderbird\profiles:

   9qflpwnsdefault
   8593y64.default-release
   fsomy6as.default

--Users\myuserID\AppData\Roaming\profiles\ shows the 3 listed above.

I have tried launching Windows 11 in Safe Mode, same issue. I have tried the Troubleshoot Tool with same result.

Any ideas on how I can get TB to load correctly and show me my emails?

Please let me know if you need additional information.

thank you, George

I have several open email tabs but they are showing nothing and when I find the email in my in box it opens blank I've also had problems with thunderbird opening have had to restart computer several times?

This is Ellen. I tried restarting Robert's ( my late husband) computer after it crashed and I got the message about Thunderbird's inbox folder not being able to be opened because it is in use by some other operation. It is an old Mac Mini running 10.13 and it says TB is 115.18.0. I don't update it because I don't think his OS can handle anything newer. I just looked and my Mini with an M1 chip (4 y/o?) is running 140. something.

How do I get it to quit whatever it is hung up on? His email is coming in ok on my iPhone.

Robert was a sculptor who made large kinetic works and a lot of his work is still on this computer.

Please help me get out of this mess. I think it has happened before.

Ellen

Home Mozilla Thunderbird (Not Responding) is all I see on the screen.

I have rebooted, reinstalled and still cannot get Thunderbird to start. I have not touched the C:/Users/.../AppData/Roaming/Thunderbird data (where I assume the problem is).