releases / downloads
install it, then to disable updates, import this registry file (depend on your thunderbird architecture)
start the application & close it, then navigate to
we will find a folder like xxxx.default-release, copy the HorlogeSkynet/user.js inside this folder
start the thunderbird > Tools > Options > Config Edit
should be this entry (this is a dummy entry added by HorlogeSkynet/user.js to validate that is loaded)
install it, then to disable updates, import this registry file (depend on your thunderbird architecture)
Code:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Thunderbird]
"DisableAppUpdate"=dword:00000001
#OR for x86
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Mozilla\Thunderbird]
"DisableAppUpdate"=dword:00000001
start the application & close it, then navigate to
C:\Users\%username%\AppData\Roaming\Thunderbird\Profiles
we will find a folder like xxxx.default-release, copy the HorlogeSkynet/user.js inside this folder
start the thunderbird > Tools > Options > Config Edit
should be this entry (this is a dummy entry added by HorlogeSkynet/user.js to validate that is loaded)

Mozilla.Thunderbird Releases have been in ESR fashion since 24.0 and on. source