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I cannot open the email program with Thunderbird, I have trie to open it by pressing Shift and Thunderbird Icaon, thus the Repair menu opens, I have tried every combination in that , like starting in the secured modus, but it did not help, I have tried to delete the "parent-lock" data in %appadat%\Thunderbird\Profiles\ - it said that I cannot delete it,because it is opened in Thunderbird. Would you kindly help me? Thank you very much

On Thursday 3rd September 2026 Firefox stopped working. I tried lots of things to get it to work to no avail. Today, 8th September 2026, I had already deleted the Firefox that was already on my PC so I downloaded a fresh copy from the Firefox website and installed it. It ran perfectly for about 30 minutes then I shut it down. 5 Minutes later, a Firefox crash report appeared which I duly sent of. Checking Event Manager a string of error messages saying the same thing, Its the XUL.DLL file that keep crashing! This was the same file that caused the failure last week. I had made sure that XUL.DLL was not on the pc when I downloaded Firefox today. When I click on the Firefox icon it open but stays on a black lower half of the screen and boxes at the top, white lined but black and transparent lines moving left to right across them, eventually it fails and closes, after a few minutes it send the crash report. Its a shame because I have used Firefox for many, many years and now having to use Edge!!!!

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!

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.

When are you finally fixing the exponentially raising problems to work with Thunderbird and Gmail? It is getting totally out of hand! Since my upgrade to the latest version NOTHING works anymore!

After stating TB the imap.gmail.com is running forever, freezing TB up. After ending the hung up programs 5 TB processes remain. Even after trying to kill them in the taskmgr, one remains active forever, is NOT kill-able anymore, and PC needs to be rebootet. End of story!

TB become a HORRIBLE Disaster!

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?

I was having problems with my chromebook. when I start my chromebook and i click on the thunderbird icon it doesn't open ! I have restored my chrombook and reinstalled thunderbird again but the problem is still there. The only way to access thunderbird is to open linux and type in thunderbird and then i have access to thunderbird once I turn off my chromebook and then reopen it once again thunderbird is not working !

Running Windows 10 (have extended security updates). Starting at version 153.0 Firefox hangs (spinning cursor) until Windows realizes it is not responding and lets me stop the program. Seems to be independent of the website (even happened on a Mozilla page). Have tried a couple of 153.xx updates and also 154 but behaves the same. On a Dell Inspiron 7570:

Processor Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz 1.99 GHz Installed RAM 8.00 GB (7.84 GB usable) Storage 932 GB HDD ST1000LX015-1U7172 Graphics Card NVIDIA GeForce 940MX (4 GB), Intel(R) UHD Graphics 620 (128 MB) Device ID 8036C0FE-3179-4D8D-8C72-672ED25B0ABA Product ID 00325-96206-88905-AAOEM System Type 64-bit operating system, x64-based processor Pen and touch Pen and touch support with 10 touch points

Hi, Firstly, thank you for all your services.

When working in a tab, Whatsapp, Youtube, or even Buzilla when I want to report this, the tab just crash's. Sometimes I can restore it immediately, but other times if I click on "Restore this tab" repeatedly, the whole window crash's!

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

Hello, we have a DLL product that is injected into Firefox, and it generally works properly. However, from time to time, we encounter crashes like this in individual tabs.

Could you please help us understand what might be causing these crashes?

I’m also sharing the crash report for reference.

Crash ID: `52627b3c-6243-4f14-8f61-e51090260831`