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This is maddening. A couple of days ago TB started to freeze. I have not added any new add-ons. I don't even have any add-ons. I tried one suggestion of repairing and compacting folders and that did not help. I also tried the accessibility.force_disabled change from 0 to 1. It is still happening. I have to use Task Manager to shut it down because if I right-click and close it tells me that TB is already running but not responding when I try to restart it. It takes 4-5 tries to get it to the point where I can have a few minutes to do anything in the program. If I leave and come back, the mail window is frozen. Help, please! I have been using TB for years and never had this problem!

Image below shows "nothing" Un-responsive but for closing. Had malware bytes and avast. Deleted both. Uninstalled/reinstalled Thunderbird twice. Same problem (attachment) Can't identify those little symbols across browser. Do0es't work at all. Any suggestions appreciated Robert

whenever i stop, backtrack or advance a video as in youtube i can expect it to crash. the same with pages containing videos. also playing music sound clips i can guarantee a crash. this has been a problem for years.

Since downloading the New upgrade today I cannot access anything! TAb crashes everytime. Wish I could go back as have used firefox for years and will now have to find alternative. Have had use the dreaded chrome to post this!

Hi

Thunderbird is crashing with error message: expected value at line 1 column 1

Error message in crash dialog box: " Thunderbird Crash Reporter Thunderbird had a problem and crashed. Unfortunately, the crash reporter is unable to submit a report for this crash. Details expected value at line 1 column 1 Restart Thunderbird | Quit Thunderbird "

troubleshooting so far:

• How often? periodically (sometime within minutes of loading, sometime hours).
• uninstalled, rebooted, reinstalled Thunderbird (using winget)
• created a NEW profile (have to re-download mail / folders ... taking day(s?) ... since when I walk away and come back hoping download has finished but it has crashed) ... not sure when it will get caught up ( main mail file is huge (20+GB) )
• tried: accessibility.force_disabled changed from 0 to 1 (found suggestion in a google search)
• tried: troubleshoot mode (even though I don't use any add-ons)
• I use multiple mail accounts (although currently I'm only using main one, trying to isolate problems)

Thanks for help.

I have Windows 11 and just installed the latest Firefox update (145). But every time I try to open a site, the page crashes. I seem to be able to work in troubleshooting mode, but otherwise I'm dead in the water.

Is there any way to roll back to version 144?

Help!

Hi everyone,

I’ve run into a weird issue with Thunderbird on macOS 26 (Tahoe) and I’m wondering if anyone else has seen this.

When I close the main Thunderbird window using Command + W or RedDot Close Button, the window disappears like normal, but something is still left behind. It’s like an invisible or “ghost” window stays on the screen. Because of that, I can’t click anything that was underneath the Thunderbird window. The area is still blocked as if the window never fully closed.

If I open Mission Control (F3), I can see an empty tile where the window should be, which confirms that something is still there even though it’s not visible.

A few details: • The problem happens every time I close the main window with Command + W • Thunderbird keeps running in the background, but I can’t bring the window back unless I quit the app completely • This only happens with Thunderbird, no other app on macOS 26 has this issue on my machines • On previous macOS versions I never had this problem

System info: • macOS 26 (Tahoe), fully updated • Latest stable Thunderbird release • Mac mini M4 and MacBook Air M4

It looks like some kind of window management bug on macOS 26, but only triggered by Thunderbird.

Has anyone else experienced this or knows if it’s a known issue? Thanks!

I am using Thunderbird v140.4esr (32-bit), and the app hangs shortly after I try to create a new email, and I have to close the program and start again. I am using Windows 10 v22H2, current October patch. Whenever I try to create a new email in Thunderbird, I can type about a paragraph or two, then the window with the new email freezes, and the only way I can proceed is to force the program to close and start again. Sometimes I can recover part of the new email by choosing Drafts, but shortly after, it will hang again, and the process starts all over again. This has only started recently. It was functioning properly about a month ago. Why is this happening, and what can I do to mitigate it?

I have experienced Mozilla Thunderbird 140 (or higher) esr (64-bit) running under Windows 11 suddenly freezing up during writing e-mails, particularly (but maybe not exclusively) when a file has been attached to that email (before it has been sent). Has anyone else experienced this, and are there any easy fixes? Thx.

I have used TB since Windows XP days, so very familiar with it. Currently using 140.2.0esr on Windows 10.

Two or three days ago TB updated to 140.x and since then, it has been crashing every time I compose a message. Within two minutes at most, the program hangs, the GUI becomes unresponsive, and Process Explorer reports that TB is using 16.79% of the CPU. It stays that way indefinitely.

After a lot of observation (and saving drafts, and restarting TB over and over and over) I have narrowed this down to typing the apostrophe character. Typing a word like "shouldn't" will hang TB, sometimes on the ' character, and sometimes a second or two later which allows a few more letters to be typed. The problem persists with Troubleshooting Mode enabled.

I have changed nothing in TB. At least, nothing I am aware of. Same keyboard as last week.

Yes, I realize that this sounds crazy.

Does anyone have an inkling about what's happening here? Thanks.

Hi I have a problem since few weeks. When I try to reply to email and when I try to copy a fragment of the message below, the programme freezes and I have to restart it. Every attempt to copy a fragment of text when replying to an email causes the same thing to happen.

When scanning headers and/or reading messages there are long delays with OS pop up saying Thunderbird is unresponsive. It typically happens when downloads and copying are occurring in the background. TB seems to be giving too much priority to the background making everything in the foreground slow and frequently stop completely. When composing a message a typed line does not appear for 20 seconds or more making it difficult to prevent typing errors. I have not had this problem with older versions of TB. My local message store is well over 20 GB. I expect some operations to take awhile but none should slow or stop response to immediate entry. When TB logs into servers and there are network problems input at the keyboard is often ignored completely. To regain control I have to call the task manager and do end process and restart TB. At first I thought this was a problem with one computer. I have several with a mix of several versions of Windows (7,8,10 and 11) with several email addresses and have the same problem in varying degrees with all of them. If this is a setting problem I have no clue how to fix. I have been using TB more than a decade and feel confident about how to do most operations. I'm using version 140.3.0esr (64bit).

If there's one thing I can count on, it's that the next version of Thunderbird will be more buggy & unstable that the previous version, and v 140 certainly does not disappoint in that category. It crashes & closes multiple times per day. Any time something else may be using a lot of resources, Thunderbird freezes up and if I click on it, the app crashes & closes. At least the previous just stayed greyed out until it was able to complete the task and didn't crash & close. Great job Mozilla.

Since i updated to 144 Thunderbird works well once started for a few minutes and then starts eating memory and in a few minutes it uses all system memory (64GB) and when virtual memory is exhausted it crashes

Now using 145 beta with same problem.

Using google calendar and only one plugin (Clippings for Thunderbird), tried to disable plugins, calendar, hardware acceleration, tried to compact folders, clear cache, clear msf with no success

The x appears in the tab, and when I click on it, the program disappears. I bring it back up and it repeats. Have tried closing the program, restarting the computer, using the Close Tab from the File menu, CTRL-W, yelling at it loudly, but nothing has worked. I cannot update the iOS in this computer. Firefox is up to date. Several programs I need can only run on Firefox , not Safari, so I need it. I now have so many open tabs that I can't find anything. HELP!