Using Local Policy on a NON-DOMAIN COMPUTER

I downloaded the admx files for Mozilla Firefox and put them in with the other Windows provided Administrative Local Policy Templates, thinking that it SHOULD show up in the Group Policy Editor tool provided with Windows 10. Apparently I could not have been more wrong. Does anybody know how to make the template show up on a non-domain (Home PC running Windows 10 Pro) computer? Granted, I know I can't control it from "Active Directory" since there is none, but I still want to add this functionality to the PC.

What I have tried: I renamed C:\Windows\PolicyDefinitions to C:\Windows\PolicyDefinitions.old I then Reopened GPEditor and verified all templates had been cleared of viewing (Empty set). I then created a new folder called C:\Windows\PolicyDefinitions and copied the files into it. It refuses to read the Firefox, but everything else shows back up. I downloaded the files again, and reinstalled them, but it still does not show up. I then Rebooted the PC, but my attempts were futile. Any assistance would be appreciated.