Where to write firefox autoconfg file if firefox is installed from Microsoft Store

I am using Mozilla Firefox on MS Windows 10. I want to add an autoconfig file to lock some preferences. As per this doc firefox.cfg and autoconfig.js need to be saved in the same directory where firefox is installed. https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig I had downloaded firefox from the Microsoft store. Firefox is installed in the %programfiles%/WindowsApps folder, which is owned by 'trusted installer'. Because of this a normal user cannot write to this folder, not even with Admin access. Is there a way to set auto config without changing folder permissions? Can I save the firefox.cfg and autoconfig.js somewhere else other than the install folder?