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Hi all,

I've been using Thunderbird for eons but yesterday morning it started freezing up constantly.

It freezes up ("Thunderbird is not responding") every time new emails are received or any time I take any action while the Inbox folder is open. So, if I delete an email it freezes for a few minutes. If I do anything pretty much, it freezes up for a few minutes. Then it comes back and I can do another action, and it freezes again. This only seems to be happening when I have the Inbox open - if I go to other folders it seems to function normally.

Things I've tried without success: - Troubleshooting mode - Adding exceptions for my profile folders to Windows Defender - Compressing Inbox (and Trash and Junk) - Repairing the Inbox index

This doesn't appear to be a memory issue - right now, memory use for my entire system seems to be hovering at just over 50%. But Thunderbird is still freezing.

My Inbox folder is very large, but it's never been an issue before and nothing significant was added yesterday when it started failing.

Any suggestions appreciated!

Thanks

Hi

Long-term Thunderbird user and in the past couple of months Thunderbird on my PC on connecting to my mail server goes to a time out (about a minute?) before then downloading new messages. Connecting from my laptop is instant.

The PC - which is relatively new - performs well otherwise.

Checked settings on both and they are identical, save for the laptop.being 64-bit and the PC 32-bit versions.

Any ideas for me to try?

Many thanks

Rick

I have two installations of Thunderbird on two different computers 2 different locations, both are new installations. Both are on Windows 11. The one at home, works perfect, the one in my second home too except the unified toolbar is unresponsive, whatever I click there it doesn't respond, The X doesn't close the program, the - doesn't minimize anything, just nothing happens, any advise?

Greetings!!

I started getting the most bizarre problem over the last couple of days from Thunderbird. Suddenly, for certain emails (not all of them), Thunderbird will start truncating the email. The email just stops loading partway through, and the email is not marked as read as it usually is. There is no progress bar at the bottom to indicate that the email is still loading. But, if I view the message source (via the View menu), the whole email is there. It typically happens with emails with either images or ones that fetch some sort of dynamic content.

I've repaired folders, rebuilt summary files, removed parent.lock, restored a backup of both program and message files from two days prior to the problem starting, reinstalled my current version of Thunderbird, rebooted the computer by holding the power button down for a minute, tried Thunderbird Troubleshoot mode, tried Windows 10 Safe Mode, disabled all add-ons, cleared my cache (under disk space), cleared my startup cache, created a new profile, compacted folders, and (temporarily) gave it a free pass through my Firewall. Nothing had any effect.

The Thunderbird Error console doesn't show anything in particular different between emails that load fully and those that do not.

To say I am at my wit's end is an understatement. Is there some sort of simple solution I am totally missing, by any chance? Thank you for any assistance!!!

Hi I was using TB 142 without problems. When upgrading to 143 ou 144.B4 I have problems sending mails to all users after some times. Usually the first mails are sent immediatly but after around 10 mails, I have very slow response (varies from 5 sec to more than 1 minute and sometimes timeout). Usually quitting TB solves the problem but this is very annoying. I went back to 140LTS and sems to have no longer this problem. This was tested on many diffrent networks. I am running under Fedora release 42

Thanks

I was running TB 128.11.1esr up until 10:00 this morning on Windows 10 Professional 22H2 64-bit. I have some e-mail messages that I cannot delete. This morning I auto-upgraded to 1o 128.12.0esr and then to 140.0esr. I still cannot delete the messages When I try to delete a group of messages (containing the message in question), the messages in the in-box turn from black to gray, and I see at the bottom "Moving messages to Trash". But nothing happens. I did a "Compact folders", and it completed without any error messages. I can look at my Trash folder, and the contents seem to be intact. In one case, I individually deleted all of the messages except one. With this one, I open the message and see nothing in the bottom message content pane. When I do a "cntl-u" to see the RFC 5322 message headers, I see a window that is completely blank. What is happening, and how can I debug this? Thanks.

When i minimize, it starts "eating" ram the computer crashed when it consumed 59GB of ram.. suspect memory leak.. One solution is turning it off after checked for mail...But i kinda want it minimized so i don't have to check by starting it every now and then..

Moved to New Question related to 'Sent' file size: https://support.mozilla.org/en-US/questions/1485833

OK, I noticed my Sent mail folder has a file size of > 3 GB (3,224,360,399 bytes) Probably why it is not being read How can I reduce the size of this file (without being able to open it in Thunderbird)?

Under no circumstances is thunderbird loading a profile (existing or newly built).No crash report. Completely empty. New installed program and/or new installed post boxes + copied Mail-folders from existing profiles into a new profile will work once or twice or a few more times. At least next day TB starts only complete empty. I tried to fix it many times - using corresponding different forums.

The last couple weeks any emails from a business only have red horizontal/vertical grid lines. If it says to view or track package it won't let me, do it. If I drag that email over to another folder it acts normal and if I drag it back to my in box it has the red lines. I've checked the emails in the server, they are normal. Also, there is yellow bar at the bottom of the attached email. It acts like a message I'm trying to send because the to is prefilled out with my email address. Weird Dell Inspiration 366B Ram 8GB 64-bit operating system Windows 10 V 22H2 Thunderbird 32-bit 128.9.0 release 3/18/2025

I have noticed a weird scrolling bug in Firefox since either v138.0 or v138.0.1.

If you go to https://www.architecturaldesigns.com/ and select any floor plan, if you attempt to scroll down the page the page will not let you and snap back to the top.

I tried this in Firefox troubleshooting mode with all add-ons / themes disabled and encountered the same behavior. This is something that just started happening in the last version release or two.

This is present both on Windows as well as Mac versions of the Firefox browser.

This is an odd one I've not encountered before. I have TB installed on 2 laptops at home. They are up-to-date with 128.6.0 installed, and both are using the same wi-fi system.

All of a sudden a few days ago, TB on one of the laptops, but not the other, became noticeably slow in deleting messages. It now takes a few seconds for what before always happened instantly (and still does on the other laptop).

Not the end of the world but it's annoying and I'm hoping there's an easy fix.

Thanks for any help.

Andrew

Hey there since a week when I brows with Firefox on Windows desktop the RAM uses jumped from around 60% spiked to 92-95% RAM and that changed just come a long a week ago. If change brows like Chrome different story, back down at 65. So you can also see a massive number on Firefox system running.

Question: Whats the reason for the change? What happend?

Best, Janosch

I have just installed Firefox on a new iMac, running MacOS 15.2. Firefox will not load any of the websites I have tried, whereas Safari and Chrome do. I have cleared the History and also set "No proxy" but loading still fails.

I have 2 Windows 11 laptops running Thunderbird. Retrieval of POP3 account email takes 10 times longer on Windows 11 as compared with Windows 7. I have 13 different email accounts. If there is nothing new to download, my windows 7 computer takes 5 seconds to check all account. Windows 11 takes 50 seconds for the same task... clunking along very much slower. I have tried many approaches to tracking down the cause of the slowness. Antivirus software (Norton 360) and various Thunderbird and system settings. Nothing makes any noticeable difference. I'm at a loss for what to try or even to finding anyone discussing the same issue. I have been using Thunderbird on at least 4 windows 7 pcs with no such issue. Both my windows laptops have the same clunky slowness. I want to move to windows 11, but this is holding me back. Is this just inherent to Windows 11? Any ideas would be appreciated. Thanks

Hello, I am unable to see my email messages in the panel. I do see the number of emails that I have, but unable to open anything. Has something major happened with Thunderbird? The email function was working fine and the next morning, all of my messages in the panel disappeared.

I'd appreciate any immediate feedback. Thank you.

Is anyone else having this bug? I'm reading through my mails and I delete one or multiple mails and then the entire box disappears and says "No Message Found." Then, I have to click on the account and then back to Inbox to see the mails again? This has been happening on the last two builds on TB??

And then I get the disk space error...even though there is almost 3T of space??

Hello,

Every now and then Thunderbird pops up the notification in the screenshot. Can anyone tell me what it means and if I should do anything about it?

Alan.