Thunderbird Community Forum

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?

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?

Was on version 115, had this problem. Updated to version 155, same problem. One of the email accounts I set up on Thunderbird is redacted1@lake48.net, registered with 123-Reg. However, this is a forwarding address and has no email server, which is why I am getting the error now.

Messages addressed to redacted1@lake48.net are forwarded to redacted2@lake48.net, which does have a server, My system was to download from there and use a rule to divert the incoming message to my redacted1@lake48.net Inbox. This has worked OK until now. Thunderbird gives me this error right at the start and then does not respond, so I cannot get in to investigate account settings, and cannot access emails in other accounts such as gmail. 123-Reg has today changed its system, assuring me I don't need to change anything. Clearly I do, but I can't get in to change it.

What should I do to resolve this? I have no other access to my emails.

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 !

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.

thunderbird startet nicht/ will Anmeldeinformationen für eines meiner yahoo-email-Konten in separatem Fenster / hängt komplett fest / keine Rückmeldung / kein Zugriff auf gar nichts...

Starting today, Thunderbird freezes during the "loading messages" process. I get a Windows hourglass and Windows tells me Thunderbird is "not responding."

Task Manager shows TB running but not taking up very many CPU cycles.

I suspect a damaged database, but what do I know?

Each of the tabs above is an email/message that was open the last time I ran TB.

I have no control over TB as it 'spins.'

I cannot find my TB version because TB is frozen. But it is fairly recent.

I need help.

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

Thunderbird (current version) freezes each time an email is closed and when it does so, it freezes the entire computer. Computer: MacBook Pro 16"; Tahoe 26.2. The freeze last for 2-5 seconds before it releases.

Running Thunderbird 140.14.0esr under Linux on a Chromebook. Have tried several times to move messages from Inbox to other folders and each time TB shuts down. When I restart it has an extra blank tab. I am able to move items using the Move To menu but that's tedious. It appears there was an update 18 August but the issue just started today. There have also been recent updates to Chrome but I've done all the shut downs/restarts called for.

Since upgrading my MacBook Pro to Tahoe 26.6.2, I notice that Thunderbird continually crashes when I open it. I've tried closing Thunderbird after each check of email, and I think that helps (at least a little).

Thunderbird widow is coming up on the sceen and says loading mesages. Does not happen. And it is not possible to promt. It is also impossible to quit the programme, I have to turn off the lap top. I have upgraded, seems to be ok. but the problem is still there. Geir H W

I have just re-started my problem when this system crashes again. For 3 weeks I have sent reports of sites being crashed. The has not been any changes. It happens when on web site and also when using E-mail. HELP!

After reading my emails, I wanted to look at my address book. I clicked on ADDRESS BOOK and my book was not there. Now, I can't back up to a normal page. The only choice is to go to the taskbar and close that page. Then when I restart Thunderbird, I get the same useless page ! Now how do I get my emails ? PS I cannot get to the HELP page of Thunderbird in order to find the version number, so the number I posted below is probably wrong. But otherwise, I could not SUBMIT my plea for help. I'm really stuck !!

Yesterday and today I am opening Email and clicking on new message, as soon as I try to type in the email address that I am trying to send email to it disappears and I get error message and then I have to go back and open Email again.

My problem is that I can’t get into Thunderbird because each time I start it up I’m presented with a window that says "System Integration" (Not Responding)" and I have no way of making progress – all I can do is use Task Manager to exit TB.

The “system integration” window first appeared a few days ago and initially I was able to dismiss it by choosing the “Skip integration” option. Today was the first time it became unresponsive. No changes have been made to the system and TB should be up to date – though, not being able to open TB, I can’t check the version number (probably esr).

I have used TB for many years and have it installed on two PCs, both running on Windows 11. It’s working as normal on the other computer.

I’ve tried rebooting the computer, to no effect. I’ve also tried to open TB in troubleshooting mode but can’t get past the "System Integration" (Not Responding)" window.

It’s been a couple of months since I backed up so I’m really hoping there will be a solution that preserves all my emails, address book and calendar.

I’d be very grateful for any suggestions.