You can create a policies.json file and store that file into the ‘C:\Program Files\Mozilla Firefox\distribution’ folder.
There is an alternative solution suggested by our reader EP. To save your time, you can download the following ready-to-use Registry files: To undo the change, remove the DisableAppUpdate 32-bit DWORD value you have created, then restart Firefox. Note: Even if you are running 64-bit Windows you must still create a 32-bit DWORD value.
See how to go to a Registry key with one click. To disable Updates in Firefox 63 and above, do the following.