Add a Make target to check settings which have the same values as default Firefox Part of https://github.com/pyllyukko/user.js/issues/256
Add a Make target to check settings which have the same values as default Firefox
Part of https://github.com/pyllyukko/user.js/issues/256

nodiscc/user.js,pyllyukko/user.js,pyllyukko/user.js,nodiscc/user.js