Firefox stores settings in ~/Library/Application Support/Firefox/Profiles/iipge4v0.default-release/prefs.js. The profile name may vary!
// Mozilla User Preferences
// DO NOT EDIT THIS FILE.
//
// If you make changes to this file while the application is running,
// the changes will be overwritten when the application exits.
//
// To change a preference value, you can either:
// - modify it via the UI (e.g. via about:config in the browser); or
// - set it within a user.js file in your profile.
Firefox stores settings in
~/Library/Application Support/Firefox/Profiles/iipge4v0.default-release/prefs.js
. The profile name may vary!Also see https://github.com/mozilla/policy-templates/blob/master/mac/org.mozilla.firefox.plist.