Firstly, it's not recommended that you disable Firefox updates, which is why that option was removed from Firefox some time ago. You leave yourself vulnerable to a number of well documented security and privacy flaws that have been fixed in newer versions of Firefox. That said, you ''can'' disable Firefox updates. It's intended only for organization networks that are handling Firefox updates centrally. It only works for Firefox 60 and newer. It can be done using the <code>DisableAppUpdate</code> policy provided in either [[Customizing Firefox Using Group Policy (Windows)|Windows Group Policy]] or [[Customizing Firefox Using policies.json|a policies.json file]]. '''DO SO AT YOUR OWN RISK''' Hope this helps.