Disable Updates in Firefox 63 and above

[manikmaya]

Starting in Firefox 63, it is not possible to disable updates of the browser. Developers have removed the appropriate option from the browser's settings. Here is a solution you can apply.

1. Close Firefox.
2. Open the Registry Editor (WinKey+R then type regedit and press Enter)
3. Go to the following Registry key:
   HKEY_LOCAL_MACHINE\Software\Policies
4. Create a new subkey here named Mozilla. You will get the path
   HKEY_LOCAL_MACHINE\Software\Policies\Mozilla
5. Under the Mozilla key, create a new subkey Firefox. You will get the path
   HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox
6. On the right, create a new 32-Bit DWORD value DisableAppUpdate Set its value to 1

Alternative Solution

You can create a "policies.json" file and store that file into the "C:\Program Files\Mozilla Firefox\distribution" folder. Create a "distribution" folder in "\Program Files\Mozilla Firefox\" folder and place that "policies.json" file into that folder with the following contents:

Code:

{
"policies":
  {
    "DisableAppUpdate": true
    }
}

For Tor Browser, placed "policies.json" in "C:\Users\your_user_name\Desktop\Tor Browser\Browser\distribution"

source: https://winaero.com/disable-updates-firefox-63-above/