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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?

I have used Firefox since version 1.5 and have loved it and the community since. However, since finally scrapping Windows and switching completely to linux, Firefox has been frequently troublesome with random crashes. The crashes occur on any website I may be on and for seemingly no reason. It happens when I'm in the middle of browsing a page, just opened a new tab, or even when Firefox is simply open and I'm active on another open application.

Environment is as follows:

OS: Zorin OS 18 (Latest patches) (Based on Ubuntu) Mobo: Asus Crosshair VI Hero (Latest available BIOS) CPU: Ryzen 9 5900XT GPU: EVGA GeForce RTX 3080 XC Gaming (10GB) Ram: 8GBx4 G.Skill TridentZ RGB DDR4 (3200) Sys Drive: Samsung 970Evo M.2 Nvme 500GB

Firefox is installed via Flatpack through the built in app store in Zorin OS.

The crashes will sometimes be constant as well. Such as when it crashes, crash reporter comes up, then I click "Restart Firefox" and the second I see the window, it crashes again. This has been a constant problem though at random times ever since I switched back to Linux about 5 months ago.

Any help would be greatly appreciated. I don't want to have to change my primary browser from one that I am generally so happy with, and is also the browser that I recommend to everyone.

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!

I finally found the solution! With help from my friends at Dell Computers, that is. The crash was due to the C: drive becoming overloaded with data. On advice, I purchased an USB portable hard drive and moved all the data not needed to be on the C:\ drive. It would be nice to have more than "common sense" to decide which files and folders are needed to run the computer nicely. If there is a book or manual that can list this for me, I'd buy it and check regularly. The computer now runs nearly like a new one and I'll be looking for a while before upgrading. Note that USB hard drives are relatively inexpensive, but need to be treated similar to the way most USB drives are (Don't just plug or unplug while the data is flowing). Storing unused files will pay off so that you don't get caught having to clean house at a very busy time. Enjoy...

Mozilla Thunderbird crashes after updating from 142 to 143. When I install a clean version, it only crashes when importing account settings; when I import only email content, it works fine. Can you help?

Thunderbird has pretty much disappeared from my iMac, and I cannot find a way to solve this problem. I've restarted Thurnderbird multiple times and restarted the iMac. It came out of nowhere, and I do not know what to do. I've attached a screenshot with the screen that pops up when I open Thunderbird. None of the dropdown menus work, and I cannot access my years of email. Help!

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.

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 have a fairly old Thunderbird ESR Flatpak installed on my System76 Meerkat. Yesterday, it was working just fine. This morning, it refuses to launch, giving no error message from the desktop, and behaves as if something has been deleted.

Hi. On Windows 11. after adding an ical calendar, Thunderbird immediately stops responding. If I then stop and restart Thunderbird it continues to not respond. 1. Is there a simple way to revert to the state prior to the addition of the calendar? Or can a point of consistency be established prior to adding the calendar to make reverting to this point a possibility? 2. I presume that there is some issue with the contents of the ical. Is there any way to work out what might be the issue that Thunderbird is not handling? The calendar is a Google Calendar and works fine there. Thanks in advance.

Thunderbird started crashing randomly about 2 days ago, however, after restart, it would remain running if I switched to troubleshooting mode. I removed an add-on from Bitdefender in troubleshooting mode.

Today I can't even open Thunderbird-- it crashes on launch. It won't launch even if I hit the Shift key or if I turn off antivirus.

Here is the most recent submitted crash report:

Crash ID: bp-b52cd345-636f-445a-ab4c-764ca0250114

Can someone please give me guidance on what is going on and how to fix it?

Thank you.

Hey, I've been experiencing my YouTube and Twitch tabs crashing almost every 20-40 minutes and it's been kind of annoying.

Does anyone know if the crashes are because of my drivers or Windows not being up to date? Never had this issue with Opera before.

Here are the crash reports: link text link text link text link text link text link text link text

142.0 64-bit is still doing the crazy Inbox disappearing and waiting for it to come back. I have to click on the profile and then back to the inbox. I am just looking at and/or deleting the many spams I get and the box just vaporizes. It is very frustrating. I was under the assumption that this was going to be addressed in 140+??

The crashes are happening daily, and lately more than once a day. I'm using Thunderbird 128.6.0esr (64 bit) on a desktop PC running Xubuntu 24.04.1 LTS. There are about a dozen accounts that get mail automatically from POP servers. The crashes happen when TB is running in the background, or on another dessktop, or minimized. I'm using a new profile created a few weeks ago because the old profile folder had grown very large. This problem did not occur with the old profile.

Here are the most recent crash report IDs: bp-ee9dfb2e-52e0-40b1-a26e-1de2a0250122 46 minutes ago bp-89c99656-b58a-47fc-a2be-c40c50250121 8 hours ago bp-90c851b2-981f-4e3c-b8f3-96ecd0250121 1 day ago bp-1dd4e625-0aa7-4c8e-9ab4-2cdfa0250120 2 days ago

Bonjour, Thunderbird/ Windows 10 home /64bits 1 Depuis 2025/03/15 Envoi de mail impossible (réception OK) 2 J'effectue 2025/03/17 une restauration de Windows au 2025/03/12, date du dernier message envoyé sans problème. 3 La restauration dure plus de 6 heures ! mais j'ai un pop up Microsoft qui confirme la bonne exécution. 4 Je vérifie le fonctionnement général : Internet OK, profil Thunderbird OK, Points de restauration antérieurs au 2025/03/17 disparus; compte tenu de la durée exceptionnellement longue de la restauration je pense que windows a dû procéder à quelques réparations..il semble d'ailleurs un peu plus "agile". 5 J'effectue une double sauvegarde de mes données (profil TDB inclus), au cas où... 6 Je démarre Thunderbird , ECHEC !; message "Couldnot load XPCOM".

Je propose de désinstaller TDB puis de le réinstaller; qu'en pensez vous ?

MERCI d'avance

When I open Firefox for the first time after logging in to my macbook, after a few minutes, a second Firefox icon appears in the dock at the bottom of the screen. Why is this happening (only started a few days ago)? And how do I stop it?

I was able to set up my main account when I installed Thunderbird. The app is fully up-to-date. Now, when I try to add any mail account - enter name and E-mail address - screen goes pale and the doughnut icon spins endlessly. CTRL+ALT+DEL to kill the app. Tried in safe mode - still no go. In every other respect, the app works fine. I can access the other accounts via Outlook, so not a huge deal, but would rather do everything in Thunderbird now that I have switched. Don't want to have to reinstall or create a new profile as I have only just set Thunderbird up (about a month ago).

Such an annoying problem with current version 128.5.2esr. On one notebook with Windows 11 Hone I install the latest version (no Thunderbird previously installed), works fine.

One another notebook with Windows 11 Home existing Thunderbird freezes. After startup it just hangs, using so much CPU, that the battery is half drained after 30 minutes. Then reinstalling does not help. The same issue persists.

I read that uninstall does not remove the profiles and that cause the issues. Is that possible. Feature request. Also it would be fine to have the option to remove the profile on uninstall, so the non-tech savy user has also a chance of using this client.