I-Thunderbird Community Forum

Was kann ich tun? Habe Probleme mit mozilla. Bei derAuführung der Programme Thunderbird ( ständig ) und Firefox ( manchmal ) kommt es zu Abstürzen wie Programm keine Rückmeldung, einfrieren so das keine Eingaben mehr möglich sind und ich jedesmal das Programm schließen und neu starten muß.

I have/had two different problems with the same results. In the first case I get the login window. I enter the password hit return and that window goes away and some times you can scroll to different opened emails before it says "Not Responding". The only action that works is to exit the app. Usually after a few days or weeks it will start working and does so for a few days or weeks. Lately the login window does not appear when the app opens and it displays the "Not Responding" message. It shows that it is "Loading Message". I have tried all of the options from the troubleshooting window and reinstalled Thunderbird with no change in response> Where do I go from here?

Even when it opens correctly a message appears:

The certificate for mail.capsense.com is not valid for that server. Someone could be trying to impersonate the server.and you should not contijnue.

Greetings,

I've lost the ability to receive e-mail, Suddenly Thunderbird just quits on me with no warning. Apparently I can still send mail but cannot receive. This is the second time this has happened to me in as many months. How do I fix it? How do I prevent it?

Thanx

I have down loaded the latest version of Thunder Bird. The program still has my settings to access my e-mail. For some reason every time I try and read my e-mail the program locks up and I have to do a Task Manager to stop the program Any and all comments would be appreciated. Thanks Dave

Additional details:

• Operating system: Windows (please specify your Windows version if known)
• The issue started on August 25, 2026.
• Thunderbird becomes unresponsive shortly after startup.
• A “System Integration” prompt appears before Thunderbird becomes unresponsive.
• I cannot click any buttons once Thunderbird becomes unresponsive.
• I tested both available profiles (“default” and “default-esr”) using the Profile Manager, but the same issue occurred with both profiles.
• I also started Thunderbird in Troubleshoot Mode with all add-ons disabled, but the issue still occurred.
• I can force-close Thunderbird through Windows when it becomes unresponsive.
• I have not deleted or modified any Thunderbird profile files because I want to avoid losing existing email data.
• The profile containing my email data appears to be “default-esr”.

I would appreciate any guidance on how to identify the cause of this issue and restore Thunderbird without losing my existing emails.

Abbreviations ( Nat'l for National) locks up a send function. A mis-spelled word locks up TBird when I click send. For either instance the mouse will not click on anything except the red X delete.

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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Running windows 11 Pro and in the last microsoft update my thunderbird email is not responding at all. It is trying to connect to imap.gmail.com.

How can i turn off auto account checking on startup so i can access my email settings to try and fix this?

I tried running it in safe mode and i get not responding there too! Can i access a profile folder and turn off auto email checking somehow?

When trying to open Thunderbird it does nt with the message "Thunderbird Not Responding" I try to open in Troubleshoot mode but that does not wotk either. I have to start and re start the laptop and finally after many tries it finally opens. Frustrating

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!