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I have been using Thunderbird for years with no problems. However recently, Thunderbird very often simply stops responding. Sometimes it just hangs up and sometimes the program bar at the top displays "Mozilla Thunderbird (Not Responding)". If I try to wait for it to respond, it literally hangs for several minutes before it begins to respond again, and often, it simply never starts responding again. It has simply gotten to the point where Thunderbird is practically unusable. All my other application software continues to work with no problems. It's just Thumderbird.

The version number in this submission may not be correct. I can't provide the real version number because of the hangups.

Any suggestions?

Tabs will crash over and over again. I can barely look at any given page for longer than a minute or two. What happened?? Firefox was never like this before. It just crashed in the middle of me typing this LMAO. Using Brave in the meantime. This is ridiculous.

Bruce Caress

May 7, 2026, 15:17 CST

Hello, I've been watching MSNOW at 4pm eastern and after about half an hour it crashes. I get a message to send a report and restore the tab. I restore the tab which works for maybe ten minutes and crashes again. I am using Windows 11 on a new computer. I'd appreciate some assistance. Thanks. Bruce Caress

Moderator note: This question has been edited to precise Firefox and OS version, based on the crash reports.

Since 3rd September 2026 Thunderbird opens a system integration window and then goes to not responding. I cannot access my emails through this software at all at the moment as there's no way past his pop up. Version 153.1.1, Windows 11 Home.

Hello, I run Firefox mobile on a Motorola g stylus 5g, and although I'm aware it's a lower-end device, the constant crashes with the app is becoming infuriating. I'm on the newest version, and a large majority of these crashes occur when I'm on twitter browsing posts.

These crashes can happen a few minutes into browsing to an hour, and this issue used to never happen until the update before this one. I use a few extensions related to appearance, those being Ublock origin, dark reader, and control panel for twitter. Performance regarding being on the website has always been awful, but it's never crashed before.

In addition, the app is insistent on reverting me to tabs I had either an few hours ago to days ago, and it changes to what I currently had on screen for unexplainable reasons. I've tried resyncing tabs but this rarely solves the issue

Any advice in resolving these crashes would be appreciated. Attached is my crash log.

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

My crashed ID is "bp-24b627a1-1416-4c09-a4ab I am a novice with this as I have not received any emails for 4 days. My email account is garmson@aussiebb.com.au thank you. Please fix and I await your reply.

Thunderbird keeps getting stuck, both when I'm writing mail and when Thunderbird tries to copy mail to sent items. I get the message "Thunderbird is not responding". What is the problem and how can I solve it?

As of today my Thunderbird no longer opens. I have tried reinstalling the app but it still won't open! The mobile app still works but not the desktop app. I am using a MAC!