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1 answer
Hello,
For Firefox, it's a registry key (But that's all I know)
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox]
"DisableAppUpdate"=dword:00000001
There might be the same thing for Thunderbird? Since it's the same company.
Like:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Thunderbird]
"DisableAppUpdate"=dword:00000001
You should test or look for a match yourself because I can't, I don't use Thunderbird.

This is exactly what I just found here:
https://gist.github.com/GodSaveEarth/ac8e3d96d43f3073eb1da7a842169e56
Hello,
it can also be done graphically, by disabling the update service and possibly the scheduled task (I don't remember if there's one, I uninstalled Thunderbird).
Hello Brucine,
I never install the Firefox maintenance service.
But despite that, it tries to update itself, and there's nothing in the program interface that allows it.
Not knowing Thunderbird, but knowing the company, I believe it's similar; as soon as it can, it checks for updates, and there’s not much to do to prevent it except with a .REG file.
It still works well with Firefox anyway; I'm still on version 112.0.2 because they messed everything up after that.
I will need to do some tests to make sure everything is in place before I update.
@+
Concerning Firefox, and once the maintenance service is disabled, there are indeed no scheduled tasks, I just checked.
The Firefox menu as I have set it downloads updates without installing them, I haven't tested what happens if we disable the background service.
It is also possible to (curiously, it's not the firewall that intercepts it but the defense system) block C:\Program Files\Mozilla Firefox\updater.exe (and probably maintenanceservice.exe in the same way).
In a "more refined" manner, one can configure their firewall to systematically request permission and block these executables for the IPs of Mozilla that are called.
We should be able to transpose at least a certain number of these measures to Thunderbird.