Some re-organizing of the user.js
Some re-organizing of the user.js

Move network.http.sendSecureXSiteReferrer next to other referrer settings.

pyllyukko/user.js,valdeza/personal-privacy-security-firefox-user.js,nodiscc/user.js,pyllyukko/user.js,Toromtomtom/user.js,Toromtomtom/user.js,nodiscc/user.js