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diff --git a/lib/url_handler/url_handler.js b/lib/url_handler/url_handler.js
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+/**
+ * GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
+ * *
+ * Copyright (C) 2011, 2012, 2013, 2014 Loic J. Duros
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see  <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ *  url_handler
+ *  A module using the url tool from Node.js to perform operations on
+ *  urls at various spots (tabs, caching, ...) in the add-on.
+ *
+ */
+
+// node.js url module. Makes it easier to resolve
+// urls in that datauri loaded dom
+var nodeJsUrl = require("url_handler/node_url");
+
+var urlUtils = {
+    getFragment: function (url) {
+	    var parse =  nodeJsUrl.parse(url);
+	    if (parse.hash !== undefined) {
+	        return(parse.hash);
+	    }
+    },
+
+    removeFragment: function (url) {
+	    var parse =  nodeJsUrl.parse(url);
+	    if (parse.hash !== undefined) {
+	        // Amazon track package bug fix.
+	        // when url has query string and fragment
+	        // the add-on wouldn't remove cache entry
+	        // properly.
+	        delete parse.hash;
+	    }
+	    return nodeJsUrl.format(parse);
+    },
+
+    addFragment: function (url, query) {
+	    var parse = nodeJsUrl.parse(url);
+
+	    // replace hash if it exists.
+	    parse.hash = '#' + query;
+
+	    return nodeJsUrl.format(parse);
+    },
+
+    addQuery: function (url, query) {
+	    var parse = nodeJsUrl.parse(url);
+	    console.debug('my parse search', parse.search);
+	    if (parse.search === undefined) {
+	        parse.search = '?' + query;
+	    } else {
+	        parse.search = parse.search + '&' + query;
+	        console.debug('parse search is now' + parse.search);
+	    }
+	    return nodeJsUrl.format(parse);
+    },
+
+    getHostname: function (url) {
+	    return nodeJsUrl.parse(url).hostname;
+    },
+
+    /**
+     * remove www from hostname.
+     */
+    removeWWW: function (str) {
+        if (str !== undefined) {
+	        return str.replace("www.", "", 'i');
+        }
+        return "";
+    },
+
+    /**
+     *
+     * haveSameHostname
+     * Compare that two urls have the same hostname.
+     *
+     */
+    haveSameHostname: function (url1, url2) {
+	    try {
+	        var host1 = this.removeWWW(this.getHostname(url1)).toLowerCase();
+	        var host2 = this.removeWWW(this.getHostname(url2)).toLowerCase();
+	        return host1 === host2;
+	    } catch (x) {
+	        console.debug('error with url_handler', x, x.fileName, x.lineNumber);
+	    }
+    }
+};
+
+exports.parse = nodeJsUrl.parse;
+exports.resolve = nodeJsUrl.resolve;
+exports.resolveObject = nodeJsUrl.resolveObject;
+exports.format = nodeJsUrl.format;
+exports.removeFragment = urlUtils.removeFragment;
+exports.addQuery = urlUtils.addQuery;
+exports.getFragment = urlUtils.getFragment;
+exports.addFragment = urlUtils.addFragment;
+exports.getHostname = urlUtils.getHostname;
+exports.haveSameHostname = urlUtils.haveSameHostname;
+exports.removeWWW = urlUtils.removeWWW;