@dallas87
Firefox policies is a simple json file /etc/firefox/policies/policies.json (take a look at the github repo for all values).
Quite useful is 3rdparty, which can set predefined settings for uBlock Origin.
So you install this addon in the template via repository package - mozilla-ublock-origin for Fedora, webext-ublock-origin for Debian. Then preconfigure it via 3rdparty in the template as well for later usage in a disposable. For example I configured mine to block JavaScript, iFrames, etc. as default.
AutoConfig more or less is a file in the root partition, which contains settings akin to user_pref. You can take all config values from the arkenfox user.js and put them in this file. Just note it’s needed to switch from user_pref to pref, as we are in system - not user - scope.