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Why Thunderdird now is so slow

Why you recommend to upgrade to ESR when the one that I had been using for years I don't trusted

I have Thunderbird: 128.10.1esr (64-bit)

Amparo

I am running Thunderbird 128 (any version) on a Surface Pro 9 running Windows 11. After sleep/hibernate or going into energy-saving mode, TB hangs for a period of minutes. Eventually it comes back, but it can take 5-10 minutes.

I do not have this problem with TB 115 on the same machine, or TB 128 on other machines (e.g. running Windows 10 or Ubuntu). TB 115 on the same machine can take a few seconds to come back (longer than on my other machines), but that s OK.

I have the same expereince whether or not I am troubleshoot mode. I have created a new profile with no add-ons (and less acounts) and I have the same problem. I was wondering if it is something to do with the fact that I have 8000 folders, and somehow TB is hanging while it checks all the folders. That account is a fastmail IMAP connection, but I have experienced similar on a backup Microsoft Exchange account (again an IMAP connection) with similar number of folders.

Any help would be appreciated.

I have just upgraded to Thunderbird 102.15.1 on my laptop and have a problem with right-click menus on folder names.

The menu appears for a brief instant and then disappears. If I move the mouse cursor slightly then it is redrawn and behaves normally.

Is this a known problem, i.e. requiring a further upgrade?

I am having a problem with my thunderbird email client. There was an update to the program over night and now when I load thunderbird it is unable to show me the content of emails in any of the folders. I can see the emails in the list and all the folders are shown in the folder tree on the left. Howevr I am not able to access the content of the emails. My thunderbird profile folder is on a network share, this fileserver is a windows based machine. If I copy the profile to my local machine the profile works correctly and I am able to open emails and view the contents. It is only when my profile is on the network that I cannot view the contents of the emails. I ran thunderbird in safe mode and this does not resolve the situation. I have tried to repair the folders but this did not work. I deleted the .msf files but this also did not work. I ran the thunderbird debugger and then tried to access an email, the debugger stopped on the follwing exception: NS_ERROR_XPC_BAD_CONVERT_JS: Could not convert JavaScript argument arg 0 [nsITreeView.setTree]. What could be the problem with my emails?

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

Just installed TB for Android on Samsung S24 Fe. Works fine but am unable to exit the application other than forcing phone back to home screen. Have installed on a Samsung tablet and the back button seems to be working OK. Anyone know of any issues with this phone and TB?

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

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.

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.

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.

Thunderbird 140.7.0esr (aarch64) on macOS26.02

For several days now, Thunderbird has been responding extremely slowly to mouse movements or clicks. This leads to undesirable results because emails are suddenly deleted that should not be deleted (due to forced double clicks). Or folders are not opened, or the wrong folders are opened.

The last change was updating Thunderbird. Is this a known bug?

Downloading emails works quickly as normal but reading opening or looking at emails (even ones downloaded weeks ago) is suddenly very slow. There is a pause before anything can be viewed even with a preview screen open.

Version is 128.7 0esr I use bitdefender - but that has never been a problem before Any ideas?

I am unable to print emails - the dialogue hangs at print preview screen where nothing is displayed apart from the circling wheel. Same for all accounts.

Fedora Linux 41 / KDE Plasma 6.2.5 / Graphics platform Wayland / Thunderbird 128.6.0-1.fc41

Thunderbird will not print to either printer (Epson Workforce Pro - WF-5110 or HPLaserJet P2015dn) rendering Thunderbird impossible to use fully.

Printers always:

• print a test page successfully
• print in all other apps including LibreOffice
• print web pages
• print same emails using Kmail client (installed as 2nd client if only to print emails as workaround)

Print using system dialogue does not work from Thunderbird (most options greyed-out including Print).

• reinstalling printers makes no difference
• reinstalling Thunderbird makes no difference

Cause: configuration setting or permissions issue or....

I'm out of options and can't think of anything else to try. As a long-term user of Thunderbird (>12 years) I'd really like to get this working. Thanks, Ric

Start up has been lagging for the last 2 weeks or so. When I open the program I see "no emails found" and the circle of death. I have to wait for 20-30 seconds before my email accounts show up and again while they download. Anyone else having this issue or is it just me?

Hi! Since a few months, I face the problem that Thunderbird stalls and is inaccessible for several seconds (>20) when a screen refresh happes or sometimes when for example a windows message pops up. I disabled/ininstalled all add-ons and also have reset all setings to their defaults. Has someone the same problem or has a hint for me? Thank you!