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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.

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?

Thunderbird is very glitchy and slow after the latest update - Thunderbird 140.11.1esr (20260522210329)

Especially, when I get a new email, Thunderbird stops responding for 5-10 seconds and then starts working.

I am using Windows 11

Recently I cannot use Paypal to process any online payment on Firefox without the browser crashing.

OS: Windows 11 25H2 Reproduction steps: a vendor would have a Paypal button. I would click on it and Firefox would open a pop-up window briefly before crashing.

The pop-up window is normal behaviour for how Paypal processing has worked on Firefox in the past. I have tried turning off potential content blockers: 3rd-party userscripts loading through ViolentMonkey, content blockers via AdNaseaum, and Enhanced Tracking Protection to no effect.

Verwalte über Thunderbird mehrere Mailadressen, jedoch läßt sich keine dieser Mailadressen öffnen. Es kommt ständig die Mitteilunbg , 'Keine Nachricht gefunden' . Bei Neustart kommt die Mitteilung Thunderbird wird bereits ausgeführt, und dann erneute 'Keine Nachricht gefunden ' ... !???

Hello,

I have added few accounts to the program, but with one account: info@danduct.pl

Thunderbird stops working and I cannot click on anything. There is no possibility to add account manually because the program hangs itself.

Please help, I don't wanna switch to other program!

Best Regards, Jan Nęciński

I've been using Mozilla browsers since Mosaic, when I built netsys.com, delta.net, inetexpress.com and Damocles.com.

I'm trying to login to many sites which send a text message to my phone... But 80% of the time, my Firefox web browser refreshes.

I'm using android 13, 1/1/26 release on a moto G play with all background operations disabled, battery saver on...

Even if I allow Firefox to operate in the background... It doesn't matter.

On my Framework 13, Thunderbird has stopped. Message reads Oups! We're sorry, it looks like thunderbird crashed. Please contact the developer if you want to report the issue. At 85, I'm anything but a nerd. Could someone please help me in simple, everyday terms? I have a lot of incoming and outgoing emails, and am completely stuck. Thank you.

It gives me no error message. Then the main screen appears with my folders as usual. (this does not happen on Linux Mint) I re-installed clean in 142 but same prob. Can I install 141??????????? I manually chose to go to 143 but no change in bad behaviour. I use only POP3 on a single gmail account I tried troubleshooting and if I select all it starts up quickly, but if I just choose to not do extensions it is slow. No extensions and stock theme. Account settings/Local Folders/Message storage points to my TBIRD folder on another partition so I can use it by either win or Mint and so it stays current/accurate for both - done that for years. Tell me what you need from the crash pending folders as there is a ton of stuff there. "geek" Thanks. (events is empty) (I found an esr for 140.3, I suppose I could try that...)

-- Asus ROG STRIX Z790-E Gaming wifi-6E, I9-13900k, UEFI/GPT, 32GB, Sam 980 Pro 1T M.2, Mint 22.2 Cinn, Win11, GeForce RTX™ 3060 Ti VISION OC 8G (rev. 2.0)

I'm experiencing an issue with Thunderbird when trying to open attached PDF files. As soon as I double-click a PDF attachment, Thunderbird immediately shuts down completely. When I reopen Thunderbird and try again, the same thing happens.

I have already restarted my computer, but the issue persists. The only way I was able to open the PDF files was by accessing the email directly through Outlook.

After Windows installed an update in the middle of the night I can't open Thunderbird and I've tried uninstalling it and reinstalling with success.

It says: Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.

I've rebooted the PC, shut down the PC, ended the task and still nothing. It seem that Thunderbird didn't shut down correctly and the system still thinks that it's open and running. Anyone know how I can fix this issue?

Thanks,

Gregg

I've always experience occasional TB crashes. According to my log history there was 1 in July, 3 in Aug, 2 in Sep, 2 in Oct, and 6 in Nov. I never really paid attention since the reboot was quick. But now in December I am losing work and it is a major problem. I've had 30 crashes in Dec and 21 in the past week. I have only 3 add ons and they have not changed, and a Copernic connector. I disable the Copernic connector and it didn't help. I have the same 140.6 on my Surface Go with the same add ons, except for Copernic and it runs fine. On both PCs I use Malewarebytes and WinDef. I have put exclusions for them in their setups. Even with MBAM completely disabled I've still had crashes.

I cleared the Cache and no help. I've even had occasional crashes in Troubleshooting mode. Here are my last 5 crash IDs

bp-070bf941-4e8b-41a3-8b84-3e3440251224 bp-a936f7c2-9ee3-4c38-b304-dab830251224 bp-8be9cf9e-8f2f-49bb-95cf-47e780251224 bp-12f8fc2c-c505-40f0-8c67-44b730251224 bp-9013fb78-086c-4327-9de8-62db30251223

Interestingly I’m also experiencing crashes with Firefox, especially ChatGPT. I cleared the ChatGPT history and that helped but did not solve the problem. I cleared the Firefox cache and in troubleshoot mode still have issues.

Otherwise my win11 PC seems to be working fine. I’ve run chkdsk and all is ok. Also scannow is ok.

Is my next step a profile rebuild?

I just updated to K-9 mail 12.0 on CalyxOS 6.10.20 Which is an Android version 15 K-9 mail crashes on startup. Clearing cache does not work. I'm asking here before i clear all data and try again

Trying to download updates from Intel.com and as soon as I click the download button, Firefox just locks up and won't allow me to do anything. I have to basically shut down firfox through task manager to get the browser to work again. I have 139.04 which is the latest update for Firefox

A message to Mozilla if this is a bug how about fixing the problems that some people are having instead of consintration on implementing AI into Firefox as I want a browser that doesn't and isn't link to AI as many other people do as well as some if not most of us are sick to ther back teeth with everything having AI installed with in the programs.

Greetings. TB crashes - It originally died after a short period of working. Managed to empty cache which seemed to have solved it, but then it came back with vengence and has given me no chance to explore as it won't load at all. I used to use folders for mail and also regularly compressed, however not the last few years. I also have a few Mozbackup files, but restoring a recent one of these has not helped. I am now finding it frustrating not being able to reach my messages. It is set up mainly as POP, with a number of different email addresses all reached through a common inbox. I have been using TB for decades and this is first issue like this. Glad of any suggestions. David

Thunderbird will run and retrieve messages from account, but keeps crashing after 1-2 minutes each time. There are a lot of archived emails, and 1,500+ in Inbox, but sufficient disk space on the PC.

bp-89f57836-bb7a-49cf-8a38-44c490250117

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?