Thunderbird wont't start (immediate crash) after latest Windows 11 update
I've been running TB for 10-12 years, generally with no problems. When I logged in on 5/13/26, I saw that Windows had run an overnight update:
2026-05 Security Update (KB5089549) (26200.8457)
Thunderbird (version 147.0.2.0) was not running, although it had been when I slept the PC the previous night.
Now, when I try to start TB it gives me the crash report dialog. Selecting the Restart option just brings me back to the crash report.
In searching for possible causes, I see that this may be caused by a bad profile. So I open the profile folder with (run) %APPDATA%\Thunderbird\Profiles\ which in my case is:
C:\Users\<user_name>\AppData\Roaming\Thunderbird\Profiles
This is an empty directory. But if I go up one level to \Thunderbird there is a profile.ini file which contains (actual user ID replaced by <user_ID>:
[Install8216C80C92C4E828] Default=E:\Thunderbird\Profiles
[Profile0] Name=<user_ID> IsRelative=0 Path=E:\Thunderbird\Profiles Default=1
[General] StartWithLastProfile=1 Version=2
"E:\Thunderbird\" is the correct location of my TB installation. In that directory is a profile.ini file that contains:
[General] StartWithLastProfile=1
[Profile0] Name=default IsRelative=1 Path=Profiles/<user_ID>.default
Directory "E:\Thunderbird\Profiles\<user_ID>.default" is present. But all of it's files are dated 2010 except Mail, dated 2016.
Directory "E:\Thunderbird\Profiles" contains the ImapMail and Mail sub directories totaling about 25GB data.
I don't know what the Thunderbird startup process is or if this all looks correct. Can someone give me a sanity check? If this looks normal, what else could be corrupted?
Thanks in advance.
Обране рішення
There is a bug report associated with the crash https://bugzilla.mozilla.org/show_bug.cgi?id=1999159
There is not much there, other than that a percentage of them probably relate to failing hardware.
There are apparently know issues with the update even installing to do with the hidden boot partition running out of free space. Perhaps check you have more that 10md free on that hidden partition.
This article advises the use of this command at the power shell command prompt to get that information (windows key + X to get the menu with powershell (command prompt) on it).
Get-Partition | Where-Object GptType -eq '{c12a7328-f81f-11d2-ba4b-00a0c93ec93b}' | Get-Volume | Format-List Size, SizeRemaining
as the component involved appears to be part of the handling of cascading style sheets (a large part or the user interface relies on them. Perhaps try starting in troubleshooting mode and see if that happens as a theme might be the difference between seeing the crash and not. (Hold the shift key while starting Thunderbird, or use the windows run dialog (windowskey+R) to start Thunderbird using the statement Thunderbird -safe-mode
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How about backing up a bit and providing the crash report ID's that you submitted. https://support.mozilla.org/en-US/kb/mozilla-crash-reporter-tb#
@Matt, here are the last three - is this the correct format? Crash ID: bp-40ca2d00-09e9-4eb3-920b-c44860260515 Crash ID: bp-b4fd556f-948e-4709-84b3-106830260515 Crash ID: bp-4e410fc0-377a-4263-bd30-995d40260515
Вибране рішення
There is a bug report associated with the crash https://bugzilla.mozilla.org/show_bug.cgi?id=1999159
There is not much there, other than that a percentage of them probably relate to failing hardware.
There are apparently know issues with the update even installing to do with the hidden boot partition running out of free space. Perhaps check you have more that 10md free on that hidden partition.
This article advises the use of this command at the power shell command prompt to get that information (windows key + X to get the menu with powershell (command prompt) on it).
Get-Partition | Where-Object GptType -eq '{c12a7328-f81f-11d2-ba4b-00a0c93ec93b}' | Get-Volume | Format-List Size, SizeRemaining
as the component involved appears to be part of the handling of cascading style sheets (a large part or the user interface relies on them. Perhaps try starting in troubleshooting mode and see if that happens as a theme might be the difference between seeing the crash and not. (Hold the shift key while starting Thunderbird, or use the windows run dialog (windowskey+R) to start Thunderbird using the statement Thunderbird -safe-mode
@Matt, Thanks for pointers. I started PowerShell to check the hidden partition free space, but PowerShell indicated I need to install the latest version. So, following a Microsoft how-to, I began the install on PowerShell v7.6.0. The install dialog box counted down to 1 second remaining and hung. There was no close button and I couldn't get Task Manager to close it, so after 10 minutes I rebooted my machine.
After the reboot, I again started Thunderbird and to my surprise it started with both my gmail and live accounts. The only thing missing was my unified folder view. Once I changed to unified view, it appears that everything is there and in it's proper place.
I may never know what went wrong. Thanks so much for your help! I'm very happy and relieved to be back in working order.
Щоб відповідати на повідомлення, ви повинні ввійти у свій обліковий запис. Поставте нове питання, якщо ви ще не маєте облікового запису.