Disable Update Pop-up Win10/11 V121+

I would like to disable the firefox update popup, and I have tried many methods:

Also tried the registry entry HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla with the ‘DisableAppUpdate’.

Since this version this seems not to work any more, the update still pops up. Is it any way to disable it completely without being a programmer? Because I am thinking to move away from firefox because of this.

Thank you in advance!