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After updating to v132 I have noticed a significant increase in the load times for some websites that our users connect to. Using v131.0.3 I usually see < 1 second load times for the two websites I am monitoring but after upgrading to v132 it is consistently taking 18-19 seconds for the same page. I have tried uninstalling v132 and reverting to v131 and it immediately goes back to the much faster load times. I have also tried installing various v133 releases and I see the same performance issue as for v132.

The environment I am working in is behind a network firewall with relatively restrictive internet access and I am wondering whether there are sites that Firefox is trying to connect to for the new anti-tracking or suspicious activity features (or anything else) that are being blocked and are therefore causing timeouts and retries that are bumping the total load time up.

Can anyone think of anything else I could check or change?

Updated to esr 128.14 Now Reddit (Redgifs) Hosting site for gifs crashes Firefox and cripples my PC. I've tried restarting in safe mode, then refreshing Firefox. Nothing is working. Reddit support just has an issue with the Gifs not playing, but nothing as extreme as what iam experiencing. I believe it may be something is preferences or a codec or something that was changed in the recent update. Any advice/ help would be great. Edit: OS is windows 10 latest updates Amd- Ryzen 7/32gig 3.20 ghz PC. So can handle a little bit of heavy browsing.. FF 128.14 esr Ext- Ublock Origin

       Search By Image 
       Flash and Download Video. 

Even with Addons disabled still occurs. Really at a loss here.

Recent problem, real nasty, may just have to give up on Thunderbird, at least on the Windows 10 computer.

Click on folder name in folder list, all messages previously downloaded and viewable, when the message list appears, it instantly disappears and the message list pane displays "no message found" and it proceeds to download the entire message list all over again. For some folders with over a hundred thousand messages, this is unacceptable, obviously.

Thunderbird just updated to 144.0.1 (64-bit), and now I see a blank area where message list used to be. This true for all accounts and all folders.

I used to see this issue temporarily after compacting folders, but usually (but not always) went away and messages showed up. Sometimes I had to close and restart TB. Now even that wont bring up the lists. I'm dead in the water. And, yes, I did reboot my computer as well. Screenshot of this state attached.

Thanks for any help--it's urgent. Bert

I've been using Thunderbird for many years, and its up to date. I've had more and more problems with choppy response times lately. It "freezes" for short periods where the interface stops responding for half a minute, or a minute or so before I can do anything. It always comes back (never crashes, shuts down). Today was some of the worst where it was minutes before I could start using it.

My junk and trash folders are empty, and I've done a compression and run the cleanup operation on a bunch of folders. My Inbox is empty. I only have 2 pop accounts. Its not when its retrieving or sending email though.

Imagine having more than 30 Accounts to be added on a single profile my concern is how will Thunderbird handles file size if it's using one file (MBOX) and if the file has no solution, can I create files and keep mails on them until they reach max size?

Thunderbird 128.5.2esr (32-bit) Odd problem in that just one folder was being identified as not being able to be compacted because of Disk Space....not true, plenty of space as I keep it regularly cleaned. I can clear the issue by making another folder of a different name, copying all messages to that folder then running COMPACT on the new folder and nothing is amiss. Run it on the original problem folder and no issues. Delete the original folder and create another with the same old name and transfer the messages to the now new originally named folder. Delete the TEMP folder. Then run a COMPACT on the problem folder and no issues.

Then run compact on the whole message tree and sure enough the COMPACT issue has now moved to a different folder. I suspect you could chase this thing till the cows come home but won't resolve, just moves it from folder to folder.

Now I could just kill Thunderbird and reinstall but this is intriging. Not sure if that would help. Ran TROUBLESHOOT MODE clean with out the only extension I use and no change. Stumped.

Thanks!

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!!!

I've been using Thunderbird for probably 10 years or more. My current version is 140.1.0esr (32-bit) - unsure when this was updated from previous version. My pc is a 64-bit pc so I'm unsure why I'm running the 32 bit version of Thunderbird.

Starting today, when I click on the New Message button, nothing happens except the button seems to register the mouse click with a slight change in appearance. Usually this would open up a blank email but I currently can't write a new email until this is resolved.

Turning off Anti-virus makes no difference. I've tried a PC restart also with no effect.

Any ideas what I can try please?

The new menu doesn't contain at least two very requently used actions:

- reload the page - go forward

There is no way to disable the new menu and revert the old behavior.

I am running TB. Using the Windows Performance Monitor, the usage jumps from 30% to 90% and then 100% once TB is open. I am running 1.128.14.0esr (64-bit). I have the before and after screenshots of the CPU, see attached. Is this known behaviour?

I tried the steps at https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance to record. The Multiprocess Browser Toolbox window hung the 2nd time (the first time, nothing happened after Capture recording), then I left it 20 minutes and came back to the message that we were unable to connect to the browser within 30 seconds. It eventually finished, painful - htpps://share.firefox.dev/41tZ5xy

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.

Thunderbird keeps coming up with the message: The folder 'inbox on dveitch@202.215.17' could not be compacted because writing to folder failed.

There is plenty of disk space and compacting has been working fine until recently. Has a Thunderbird update changed something?

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.

My green "New Message" button has stopped working for some reason. I've tried switching it off then back on but it still won't work. so at the moment I can't create new emails. Regards William

I can't add any email accounts in ThunderBird. The window keeps loading. Trying to uninstall and reinstall didn't help. It doesn't work on other devices either.

I tried to install the mailbox on another computer and the email configurator opened—I managed to add one account in this window, but when I tried to add another one, it didn't work like it does on other devices.

Downloading the latest version 143.0.

Hello,

This new version of firefox. I am experiencing icons grey out whenever I opened a new tab. Is anyone experiencing this below?

[Highlighted Icons in new Tab https://i.postimg.cc/RFzrm98Q/Screenshot-2025-03-05-012153.png]