Thunderbird Community Forum

I have Thunderbird 146.0.1 on a Win11 system, using POP. This setup has been in place from Windows 7, apart from the Thunderbird client version, and has worked up till the end of 2025. About October last year, I opened Thunderbird, and whenever I selected an email, or a number of emails, Thunderbird seems to get stuck trying to process something. The moving blue bar on the bottom right hand side of Thunderbird shows activity, but never stops. Taskmanager shows that Thunderbird is running, and that something is happening, but I cannot do anything with Thunderbird. I can only shutdown Thunderbird using Taskmanager. I have Norton AV installed, but I have turned it off, and the problem persists. I have removed all the emails from my inbox, and moved them to local files, and the problem persists. I have deleted and recreated my profile, and the problem persists. I have deleted the Thunderbird client and reinstalled it, and the problem persists. It doesn't matter if I select one, or twenty, emails, Thunderbird gets locked whilst processing something, and the problem persists. There is no issue with my Email provider, as I have checked using a webmail client. Emails are being processed and delivered from my email provider, and are received by Thunderbird. I would appreciate any suggestions as to the cause, or more importantly, a possible remedy. I have successfully used Thunderbird for many years, and I actively support them, so I am very keen to resolve this problem. Thank you in anticipation.

Ich habe Thunderbird auf meinem MacBook Air von Anfang 2015 geladen auf dem MacOS Monterrey läuft. Sobald ich einen eMail Account einrichten möchte stürzt Thunderbird ab. Was muss ich tun, um diese Abstürze zu vermeiden?

Good morning,

I want to install my account (GMX) in thunderbird on a mac book air (´11 2015 macOS Monterey 12.7.6) but thunderbird crashes every time, after I put in name, email and password and press enter.

bp-aed6c1bc-6b10-4257-a9f4-434400260101 bp-31c768c4-e099-4d79-8c34-c4ec10260101 bp-e5bdae14-6764-478e-9ce9-391750260101

Can anyone help me please?

Best regards Anna

Hi - I'm trying to install Thunderbird on my mac to get away from a google workspace account. I've downloaded it a couple times and it crashes immediately after the login screen. Same thing in Troubleshoot mode. It's a work computer so it might have something installed preventing the desktop app from working. Thanks for any help you can offer.

Ben

Hello, Here is what I consider a new bug in TB. It goes this way: While I am reading a message in the message pane of the standard window (not in its own window), if messages arrive (with a small ding for me), the message pane I am reading goes BLANK and the message I was reading is deselected. I have to reselect the message I am reading and scroll down to where I was. This behavior is very annoying and did not exists in previous versions.

I hope this helps. Thank you , Alain Damlamian

Right after typing my email address and pressing "Continue", Thunderbird crashes. I wanted to give it a try after many years of not using it, but then it crashes right at the start.

Here's the crash report:

AdapterVendorID: 0x106b AvailablePhysicalMemory: 6554927104 AvailableSwapMemory: 1233125376 BackgroundTaskMode: 0 BuildID: 20251016001905 ContentSandboxCapable: 1 ContentSandboxLevel: 3 CrashTime: 1760704144 DOMFissionEnabled: 1 DOMIPCEnabled: 1 EMCheckCompatibility: true EventLoopNestingLevel: 1 GpuSandboxLevel: 0 GraphicsNumActiveRenderers: 0 GraphicsNumRenderers: 1 HeadlessMode: 0 InstallTime: 1760652930 LastStartupWasCrash: 0 MacAvailableMemorySysctl: 91 MacMemoryPressure: Normal MacMemoryPressureCriticalTime: Unset MacMemoryPressureNormalTime: 1760704136 MacMemoryPressureSysctl: 1 MacMemoryPressureWarningTime: Unset Notes: FP(D10-L1000-W0000000-T01) WR? WR+ GL Context? GL Context+ ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird PurgeablePhysicalMemory: 465715200 RDDProcessStatus: Running ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 825 StartupCacheValid: 1 StartupCrash: 0 StartupTime: 1760704136 SubmittedFrom: Client TelemetryEnvironment: {"build":{"applicationId":"{3550f703-e582-4d05-9a08-453d09bdfdc6}","applicationName":"Thunderbird","architecture":"aarch64","buildId":"20251016001905","version":"144.0.1","vendor":"Mozilla","displayVersion":"144.0.1","platformVersion":"144.0","xpcomAbi":"aarch64-gcc3","updaterAvailable":true},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":65536,"virtualMaxMB":null,"cpu":{"extensions":["hasNEON"]},"os":{"name":"Darwin","version":"23.5.0","locale":"en-IL"},"hdd":{"profile":{"model":null,"revision":null,"type":null},"binary":{"model":null,"revision":null,"type":null},"system":{"model":null,"revision":null,"type":null}},"gfx":{"D2DEnabled":null,"DWriteEnabled":null,"ContentBackend":"Skia","Headless":false,"TargetFrameRate":60,"textScaleFactor":1,"adapters":[{"description":null,"vendorID":"0x106b","deviceID":null,"subsysID":null,"RAM":0,"driver":null,"driverVendor":null,"driverVersion":null,"driverDate":null,"GPUActive":true}],"monitors":[{"screenWidth":2560,"screenHeight":1440,"defaultCSSScaleFactor":1,"contentsScaleFactor":1},{"screenWidth":3024,"screenHeight":1964,"defaultCSSScaleFactor":2,"contentsScaleFactor":2}],"features":{"compositor":"webrender","hwCompositing":{"status":"available"},"gpuProcess":{"status":"unused"},"webrender":{"status":"available"},"wrCompositor":{"status":"available"},"openglCompositing":{"status":"available"},"omtp":{"status":"unused"}}},"appleModelId":"Mac14,5","hasWinPackageId":null},"settings":{"blocklistEnabled":true,"e10sEnabled":true,"e10sMultiProcesses":8,"fissionEnabled":true,"locale":"en-US","intl":{"requestedLocales":["en-US"],"availableLocales":["en-US"],"appLocales":["en-US"],"systemLocales":["en-IL","he-IL"],"regionalPrefsLocales":["en-IL","he-IL"],"acceptLanguages":["en-US","en"]},"update":{"channel":"release","enabled":true,"autoDownload":true,"background":true},"userPrefs":{"browser.search.region":"DE","network.http.microsoft-entra-sso.enabled":false,"network.trr.strict_native_fallback":false,"widget.content.gtk-high-contrast.enabled":true},"sandbox":{"effectiveContentProcessLevel":3,"contentWin32kLockdownState":3},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":null,"defaultSearchEngine":"ddg","defaultSearchEngineData":{"loadPath":"[app]ddg","name":"DuckDuckGo","submissionURL":"https://duckduckgo.com/?q="}},"profile":{"creationDate":20377,"firstUseDate":20377},"addons":{"activeAddons":{},"theme":{"id":"default-theme@mozilla.org","blocklisted":false,"description":"Follow the operating system setting for buttons, menus, and windows.","name":"System theme — auto","userDisabled":false,"appDisabled":false,"version":"1.4.2","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":20377,"updateDay":20377},"activeGMPlugins":{"dummy-gmp":{"version":"0.1","userDisabled":false,"applyBackgroundUpdates":1}}}} Throttleable: 1 TotalPhysicalMemory: 68719476736 UptimeTS: 7.916666666666666 Vendor: Mozilla Version: 144.0.1 useragent_locale: en-US This report also contains technical information about the state of the application when it crashed.

Thunderbird 145.0 (64 bit) with Windows 11 Pro.

In the message editor window, new message or reply or forward, when I want to insert a hyperlink using either CTRL+K or via the Insert menu, a popup window to insert the link into does not appear, and the write windows hangs. Becomes unresponsive. The only way to close it is by ending the task in Task Manager. I notice a crash helper in the Thunderbird group in Task Manager. Everything is on 0% CPU though.

What went on before this is that I modified the property editor.link_color in the config editor (because links are not readable in dark mode, but that's a different story). I then did reset it to default and restarted TB, then pc and TB, that did not help.

In troubleshooting mode, there is no problem. In normal mode, I deleted the only plugin I had (a theme) I cleared cache, refreshed Thunderbird, to no avail. It's not set up to generate crash reports yet.

I have TB on another machine (W10 Pro), I can copy my profile folder over quite easily.

Any suggestions please?

(I'm on Central European time, it may be a day or so before I respond to replies from the US.)

For about 2 weeks, EVERY time I try to write an email, after typing a few lines or so, the whole window 'grays out' and becomes UN-responsive. I get no error message. Waiting for it to respond doesn't work and I have to close out and re-start Thunderbird. Sometimes Thunderbird will have saved some portion of my email in my 'Drafts' folder, but not reliably, so I have to frequently 'Control + S' - save it to avoid having to re-type the entire message again. Troubleshoot Mode doesn't help, nor does clearing the cache. I've been hoping an update would come up that would solve this, either from Thunderbird or Windows (11), but not so far. Please tell me how I should resolve this - I have used Thunderbird for years (and regularly contribute too) and don't want to have to change to different email client.

Confused. Version 144.0.1 | Released October 16, 2025 Says 32 bit. I thought I downloaded 64 bit.

Problem: Freezes when I click anywhere on TBird desktop

How do I address the freezing problem?

Thanks Robert

Ich habe versehentlich mehrere hundert Mails geöffnet, anstatt diese zu löschen. Nun startet TB145 unter Windows 10 nicht mehr richtig. Es friert ein, auch ist die Menüleiste nicht mehr erreichbar. Ich habe auch den abgesicherten Modus Probiert nichts geht. Was muss ich tun um das zu beheben?

Hi

I am using the latest TB build, 144.0.1and have only the British dictionary as an extension, no themes.

Occasionally TB will hang when launched and the Windows event viewer will show this....(added image)_

The friendly xml log within the event viewer...

AppName thunderbird.exe

 AppVersion 144.0.1.0 
 ProcessId 0x6234 
 StartTime 0x1dc51956edcf231 
 TerminationTime 5 
 ExeFileName C:\Program Files\Mozilla Thunderbird\thunderbird.exe 
 ReportId f3ad169f-c629-4357-85ae-7db29d0541f1 
 PackageFullName  
 PackageRelativeAppId  

HangType Cross-process

as noted, this only happens when the email client is launched and will not happen each time. I have tried without the dictionary, as it is so random it can take a while to occur, but that does not seem to make a difference.

I am using Windows 11 25h2

Thanks

I recently transferred my email account to The Messaging Company (big mistake I think) because my provider (Exetel) suggested them when they stopped hosting an email service. I then started having trouble receiving emails that I knew were sent and I thought that maybe my old emails were kept on the server too long and were taking up too much space on the server so I went into Thunderbird to change the settings to delete emails that had been on the server for 2 weeks. Thunderbird is now locked onto the Account Settings page and I can't get out of it. As soon as I click on the page I get the "Thunderbird not responding" message so I close the program. I've tried starting Thunderbird in safe mode with no result. I downloaded the latest version and reinstalled Thunderbird but as soon as I start the program it takes me straight into the "frozen" Account Settings page that I can't get out of. I have gone into The Profiles folder and I've included a screenshot of what's there. The latest profile was created when I tried to change the Account Settings. Can I delete that profile and go back to the one created on 9/6/2025?

Thunderbird doesn't open. I suspect because it opens every message I get or send either in a tab or a list or both. Then there gets to be too many of these. I didn't ask for any of these things! Why can't I just get messages like I used to, and not have to constantly be concerned with closing tabs and closing lists? It is ridiculous, and now the program won't even open. I know I am asked to be polite, and it is the programmers who are at fault, not the community volunteers. But we are not allowed to contact and complain to the programmers!

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Thunderbird is freezing when I try to type a message into the new message window. It takes maybe 100 characters or so, then just freezes and requires ctrl-alt-del and end task to get out of it. This began with auto-installation of 140.0.1 as described below, and is 100% reproducible.

Environment: Windows 11 home 64 bit (specifically 2025-07 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems )

Running Thunderbird 140.0.1: Thunderbird 140.1.1esr was auto installed on July 10, 2025. Version history says that the install failed, but version showed as 140.0.1esr. This is when the problem began. On July 18th, I downloaded the release version of Thunderbird and installed that (140.0.1 - no esr). This did not resolve the problem. Troubleshooting info now shows 140.0.1 - no esr as the current version, but the update history does not show that upgrade/downgrade in the list, so I'm not sure it happened.

Things I have tried: Windows safe mode Thunderbird safe mode Clear caches Removed several mail accounts from Thunderbird

Below is system info from Thunderbird troubleshooting page.

 Application Basics

   Name: Thunderbird
   Version: 140.0.1
   Build ID: 20250709044702
   Distribution ID:

I'm using Win 11 and ver 140.3.1esr (64 bit)

Thunderbird works perfectly except for just one thing. Every time I write any email it freezes after about 2 minutes. If it's a short email, it gets sent. If it's longer, before I can get to the end, the program freezes, and I have to use Task Manager to stop it. No problem receiving and reading emails. This started about a month ago.

I use Bitdefender, but it still happens with that off. Windows is up to date. Any ideas why this is happening? Thanks.

Why for about the last week has Thunderbird been crashing when drafting a message? Often it saves a portion of the in-progress drafting, but not always. What is the fix?