Add conditional for pkgconfig(gconf-2.0) BuildRequires, and pass
conditional --disable-gconf to configure: no longer pull in
obsolete gconf2 for Tumbleweed.
pref("intl.locale.requested", "");
pref("browser.preferences.instantApply", true);
pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");