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And it is rather annoying that the report does not tell me which addon is misbehaving either. I do know it runs just fine without any addons enabled so hence, the problem lies with a buggy addon and I'm left in the dark about which one.

My Apple desktop crashes frequently in different applications (while in gmail, on Facebook, etc.) and it sends a report to Apple every time. It never does it if I use Safari. If I can reload Firefox to fix it please let me know how to do that. Thanks.

I downgraded to Firefox 140ESR yesterday to get rid of the silly circles and gradients. The update was so visually distracting I found the browser to be unusable. However, now almost any website I visit gives me a Gah your tab just crashed. Is there a way to fix this while staying on 140ESR? Please refrain from answering if your solution is to upgrade. Thanks.

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.

When I try to start Thunderbird on my Windows 11 laptop it does not start properly It is haging ond after a whike i get a message that thunderbird does not respond ("svarar inte" in swedish). Sometimes if I try to reinstall Thunderbird it starts up, But today nothing happens.

Yesterday morning my Firefox was updated to version 157 and ever since it reopened it has crashed too many times to count. Sometimes it will run for 20-30 minutes, but then it will crash repeatedly in just a few moments or a few minutes after reporting the crash and restarting. I already tried reinstalling the current version with no success in solving the problem. I could not even keep it from crashing while trying to type this question, so I am now using MS Edge as my browser until I can find a fix for Firefox.

get message Firefox Not Responsive when entering text verification code for Outlook email, also randomly for only 1 bank card, this crashed entire web and have to turn off computer to even try web again, earlier 9/30 your web froze submitting this, other emails and banks/card work fine, have tried over 12 times 2026/9/29 and 9/30, have cleared cache, turned off computer, Using ESET antivirus, google works every time

I wanted to share a specific startup freeze loop I encountered today.

I had a moderate number of tabs open in Thunderbird when I quit the app. I had set up a single IMAP message filter yesterday to automatically move incoming automated text alerts into their own folder (causing about 50–60 small emails arriving in quick succession this morning at startup).

The Problem: Upon starting up, the app almost immediately choked and became unresponsive. Unlike the freeze report by another user here on August 21st.

My Workaround: After a few attempts to open Thunderbird I managed to break the freeze loop by instantly closing the single open UI window right at startup. This kept T-bird running invisibly in the macOS background. It seemed that without the need of rendering the UI, the background engine successfully completed all the IMAP syncing and filtering tasks.

When I brought Thunderbird back to the foreground, all my open tabs instantly "snapped", and the app has been perfectly stable since. I haven't tried to replicate this due to the fear of breaking the current stability.

Has anyone else recently noticed Thunderbird freezing under similar conditions lately? Let us know if this workaround helps you get past your startup freezes too!

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

Been happening for almost 2 months now and getting more frequent. What happens is FF opens normally , but reacts sluggishly. Many instances of "not responding". When I close the program , it takes several minutes to close. In Task Manager , it shows disk usage at 100% , CPU at as high as 50% , and memory at 4 gigs prior to crashing. This is on a Windows 11 Pro system with the latest updates and the latest FF.

Below are the 5 latest crash reports:

bp-334499b7-2a53-4f19-af94-cc82f0260928 bp-04a56a0a-6e85-42c0-ab03-024b80260927 bp-b0bc8d1f-0ec1-484f-bd49-aaf510260927 bp-68939250-e3c8-4bfe-9e2f-7dbcc0260926 bp-7895f7cf-32a8-48cf-a81b-f7b460260926

Submitted Crash Reports Clear All Report ID Date Submitted bp-12922f4d-e0ff-4f9c-9244-9459b0260927 9/27/2026, 1:44 PM View bp-3b91501f-4ea4-4bbf-9ea7-5578a0260926 9/26/2026, 6:40 AM View bp-b35b464f-8f0c-4e85-9261-d2da70260926 9/26/2026, 5:46 AM View bp-5ae39b13-855e-4680-bcf9-273960260922 9/21/2026, 8:26 PM View bp-36b2854c-750c-493b-9ba0-e6eba0260910 9/10/2026, 4:55 AM Viewese are the 5 most recent ones.

win11 :Thunderbird will not launch, It appears the issue is a Background Process labelled "Thunderbird" which is unresponsive to "end task" in Task Manager. Will launch after reboot.

I have no clue as to how Tbird into this state, but it has happened more than once

Thunderbird Version 156.0.1 Build ID 2026092215180