Add little arrows to the external links

Link_Blank.user.js

// ==UserScript==
// @name         Link_Blank
// @namespace    http://www.linyoo.com/
// @version      0.1
// @description  Add little arrows to the external links
// @author       You
// @require http://cdn.staticfile.org/jquery/1.8.3/jquery.min.js
// @include      http*
// @grant        none
// ==/UserScript==

$(document).ready(function() {
	$('head').append('<link href="http://netdna.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css" rel="stylesheet">');
	$('a[href*="/"]').each(function() {
		if( typeof($(this).attr('target')) !== 'undefined' ) {
			$(this).append('<i class="fa fa-level-up"></i>');
			$(this).children('.fa').css({
				color: 'Grey',
				opacity: 0.6
			});
		}
	});
});