Enable Protocol Relative URLs
By default Genesis Extender uses the common http:// URL protocol for its stylesheet for greatest overall compatibility. However there may be times where enabling this option to make its URL protocol relative (i.e.. //example.com vs http://example.com) is advantageous. Generally this would be would be when SSL pages are in play (i.e.. secure https URLs are being used).
So in most cases just leave this option unchecked, but if you're using SSL on your website and don't want to activate an https Plugin then check this box to make your Genesis Extender URLs relative.