diff --git a/src/Umbraco.Web.UI/Umbraco.Web.UI.csproj b/src/Umbraco.Web.UI/Umbraco.Web.UI.csproj
index aa1af2f426..0540b9cd06 100644
--- a/src/Umbraco.Web.UI/Umbraco.Web.UI.csproj
+++ b/src/Umbraco.Web.UI/Umbraco.Web.UI.csproj
@@ -348,7 +348,6 @@
     <Content Include="Umbraco\Dialogs\ChangeDocType.aspx">
       <SubType>ASPXCodeBehind</SubType>
     </Content>
-    <Content Include="Umbraco_Client\Application\Extensions.js" />
     <Content Include="Umbraco_Client\Application\JQuery\jquery.validate.min.js" />
     <Content Include="Umbraco_Client\Application\JQuery\jquery.validate.unobtrusive.min.js" />
     <Content Include="Umbraco_Client\Dialogs\SortDialog.css" />
diff --git a/src/Umbraco.Web.UI/umbraco_client/Application/Extensions.js b/src/Umbraco.Web.UI/umbraco_client/Application/Extensions.js
deleted file mode 100644
index 9fddaad998..0000000000
--- a/src/Umbraco.Web.UI/umbraco_client/Application/Extensions.js
+++ /dev/null
@@ -1,403 +0,0 @@
-(function ($) {
-
-    //extensions to base classes such as String and extension methods for jquery.
-    //NOTE: jquery must be loaded before this file.
-
-    //create guid object on the window (which makes it global)
-    if (window.Guid == null) {
-        window.Guid = {
-            generate: function () {
-                ///<summary>generates a new Guid</summary>
-                return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
-                    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
-                    return v.toString(16);
-                });
-            }
-        };
-    }
-
-    if (!window.__debug__) {
-        window.__debug__ = function (msg, category, isErr) {
-            ///<summary>global method to send debug statements to console that is cross browser (or at least checks if its possible)</summary>        
-
-            if (((typeof console) != "undefined") && console.log && console.error) {
-                if (isErr) console.error(category + ": " + msg);
-                else console.log(category + ": " + msg);
-            }
-        };
-    }
-
-    if (!window.location.getParams) {
-      var pl = /\+/g;  // Regex for replacing addition symbol with a space
-      var search = /([^&=]+)=?([^&]*)/g;
-      var decode = function(s) { return decodeURIComponent(s.replace(pl, " ")); };
-      
-      window.location.getParams = function() {
-        var match;
-        var query = window.location.search.substring(1);
-
-        var urlParams = {};
-        while (match = search.exec(query))
-          urlParams[decode(match[1])] = decode(match[2]); 
-
-        return urlParams;
-      }
-    }
-    
-    if (!String.prototype.startsWith) {
-        String.prototype.startsWith = function (str) {
-            ///<summary>startsWith extension method for string</summary>
-
-            return this.substr(0, str.length) === str;
-        };
-    }
-
-    if (!String.prototype.endsWith) {
-        String.prototype.endsWith = function (str) {
-            ///<summary>endsWith extension method for string</summary>
-
-            return this.substr(this.length - str.length) === str;
-        };
-    }
-
-    if (!String.prototype.utf8Encode) {
-        String.prototype.utf8Encode = function () {
-            ///<summary>UTF8 encoder for string</summary>
-
-            var str = this.replace(/\r\n/g, "\n");
-            var utftext = "";
-            for (var n = 0; n < str.length; n++) {
-                var c = str.charCodeAt(n);
-                if (c < 128) {
-                    utftext += String.fromCharCode(c);
-                }
-                else if ((c > 127) && (c < 2048)) {
-                    utftext += String.fromCharCode((c >> 6) | 192);
-                    utftext += String.fromCharCode((c & 63) | 128);
-                }
-                else {
-                    utftext += String.fromCharCode((c >> 12) | 224);
-                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
-                    utftext += String.fromCharCode((c & 63) | 128);
-                }
-            }
-            return utftext;
-        };
-    }
-
-    if (!String.prototype.utf8Decode) {
-        String.prototype.utf8Decode = function () {
-            var utftext = this;
-            var string = "";
-            var i = 0;
-            var c = c1 = c2 = 0;
-
-            while (i < utftext.length) {
-
-                c = utftext.charCodeAt(i);
-
-                if (c < 128) {
-                    string += String.fromCharCode(c);
-                    i++;
-                }
-                else if ((c > 191) && (c < 224)) {
-                    c2 = utftext.charCodeAt(i + 1);
-                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
-                    i += 2;
-                }
-                else {
-                    c2 = utftext.charCodeAt(i + 1);
-                    c3 = utftext.charCodeAt(i + 2);
-                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
-                    i += 3;
-                }
-
-            }
-
-            return string;
-        };
-    }
-
-    if (!String.prototype.base64Encode) {
-        String.prototype.base64Encode = function () {
-            ///<summary>Base64 encoder for string</summary>
-
-            var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
-            var output = "";
-            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
-            var i = 0;
-
-            var input = this.utf8Encode();
-
-            while (i < input.length) {
-
-                chr1 = input.charCodeAt(i++);
-                chr2 = input.charCodeAt(i++);
-                chr3 = input.charCodeAt(i++);
-
-                enc1 = chr1 >> 2;
-                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
-                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
-                enc4 = chr3 & 63;
-
-                if (isNaN(chr2)) {
-                    enc3 = enc4 = 64;
-                } else if (isNaN(chr3)) {
-                    enc4 = 64;
-                }
-
-                output = output +
-			        keyStr.charAt(enc1) + keyStr.charAt(enc2) +
-			        keyStr.charAt(enc3) + keyStr.charAt(enc4);
-
-            }
-
-            return output;
-        };
-    }
-
-    if (!String.prototype.base64Decode) {
-        String.prototype.base64Decode = function () {
-            ///<summary>Base64 decoder for string</summary>
-
-            var input = this;
-            var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
-            var output = "";
-            var chr1, chr2, chr3;
-            var enc1, enc2, enc3, enc4;
-            var i = 0;
-
-            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
-
-            while (i < input.length) {
-
-                enc1 = keyStr.indexOf(input.charAt(i++));
-                enc2 = keyStr.indexOf(input.charAt(i++));
-                enc3 = keyStr.indexOf(input.charAt(i++));
-                enc4 = keyStr.indexOf(input.charAt(i++));
-
-                chr1 = (enc1 << 2) | (enc2 >> 4);
-                chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
-                chr3 = ((enc3 & 3) << 6) | enc4;
-
-                output = output + String.fromCharCode(chr1);
-
-                if (enc3 != 64) {
-                    output = output + String.fromCharCode(chr2);
-                }
-                if (enc4 != 64) {
-                    output = output + String.fromCharCode(chr3);
-                }
-
-            }
-
-            return output.utf8Decode();
-
-        };
-    }
-
-
-    if (!Math.randomRange) {
-        Math.randomRange = function (from, to) {
-            ///<summary>randomRange extension for math</summary>
-
-            return Math.floor(Math.random() * (to - from + 1) + from);
-        };
-    }
-
-    if (!String.prototype.toCamelCase) {
-        String.prototype.toCamelCase = function () {
-            ///<summary>toCamelCase extension method for string</summary>
-
-            var s = this.toPascalCase();
-            if ($.trim(s) == "")
-                return "";
-            if (s.length > 1) {
-                var regex = /^([A-Z]*)([A-Z].*)/g;
-                if (s.match(regex)) {
-                    var match = regex.exec(s);
-                    s = match[1].toLowerCase() + match[2];
-                    s = s.substr(0, 1).toLowerCase() + s.substr(1);
-                }
-            } else {
-                s = s.toLowerCase();
-            }
-            return s;
-        };
-    }
-
-    if (!String.prototype.toPascalCase) {
-        String.prototype.toPascalCase = function () {
-            ///<summary>toPascalCase extension method for string</summary>
-
-            var s = "";
-            $.each($.trim(this).split(/[\s\.-]+/g), function (idx, val) {
-                if ($.trim(val) == "")
-                    return;
-                if (val.length > 1)
-                    s += val.substr(0, 1).toUpperCase() + val.substr(1);
-                else
-                    s += val.toUpperCase();
-            });
-            return s;
-        };
-    }
-
-    if (!String.prototype.toUmbracoAlias) {
-        String.prototype.toUmbracoAlias = function () {
-            ///<summary>///<summary>toUmbracoAlias extension method for string</summary></summary>
-
-            var s = this.replace(/[^a-zA-Z0-9\s\.-]+/g, ''); // Strip none alphanumeric chars
-            return s.toCamelCase(); // Convert to camelCase
-        };
-    }
-
-    if (!String.prototype.toFunction) {
-        String.prototype.toFunction = function () {
-            var arr = this.split(".");
-            var fn = (window || this);
-            for (var i = 0, len = arr.length; i < len; i++) {
-                fn = fn[arr[i]];
-            }
-            if (typeof fn !== "function") {
-                throw new Error("function not found");
-            }
-            return fn;
-        };
-    }
-
-    //sets defaults for ajax
-    $.ajaxSetup({
-        dataType: 'json',
-        cache: false,
-        contentType: 'application/json; charset=utf-8',
-        error: function (x, t, e) {
-            if (x.status.toString().startsWith("500")) {
-                //show ysod overlay if we can
-                if (UmbClientMgr) {
-                    var startIndex = x.responseText.indexOf("<body");
-                    var endIndex = x.responseText.lastIndexOf("</body>");
-                    var body = x.responseText.substring(startIndex, endIndex + 7);
-                    var $div = $(body.replace("<body bgcolor=\"white\">", "<div style='display:none;overflow:auto;height:613px;'>").replace("</body>", "</div>"));
-                    $div.appendTo($(UmbClientMgr.mainWindow().document.getElementsByTagName("body")[0]));
-                    UmbClientMgr.openModalWindowForContent($div, "ysod", true, 640, 640, null, null, null, function() {
-                        //remove the $div
-                        $div.closest(".umbModalBox").remove();
-                    });
-                }
-                else {
-                    alert("Unhandled exception occurred.\nStatus: " + x.status + "\nMessage: " + x.statusText + "\n\n" + x.responseText);
-                }
-            }
-        }
-    });
-
-    $.fn.getAllAttributes = function () {
-        ///<summary>extension method to get all attributes of a selected element</summary>
-
-        if ($(this).length != 1) {
-            throw "the getAllAttributes method can only be called when matching one jQuery selector";
-        };
-        var el = $(this).get(0);
-        var arr = [];
-        for (var i = 0, attrs = el.attributes; i < attrs.length; i++) {
-            arr.push({ name: attrs.item(i).nodeName, value: attrs.item(i).nodeValue });
-        }
-        return arr;
-    };
-
-    $.fn.outerHtml = function () {
-        ///<summary>extension to get the 'outer html' of an element</summary>
-
-        if ($(this).length != 1) {
-            throw "the getAllAttributes method can only be called when matching one jQuery selector";
-        };
-        var nodeName = $(_opts.content).get(0).nodeName.toLowerCase();
-        //start creating raw html
-        var outerHtml = "<" + nodeName;
-        //get all the attributes/values from the original element and add them to the new one
-        var allAttributes = $(_opts.content).getAllAttributes();
-        for (var a in allAttributes) {
-            outerHtml += " " + allAttributes[a].name + "='" + allAttributes[a].value + "'";
-        }
-        outerHtml += ">";
-        outerHtml += $(_opts.content).html();
-        outerHtml += "</" + nodeName + ">";
-        return outerHtml;
-    };
-
-    $.fn.focusFirst = function () {
-        ///<summary>extension to focus the first editable field in a form</summary>
-
-        return $(this).each(function () {
-            if ($(this).get(0).nodeName.toLowerCase() != "form") {
-                throw "The focusFirst method can only be applied to a form element";
-            }
-            var first = $(this).find(":input:enabled:visible").not(":submit").not(":button").not(":file").not(":image").not(":radio");
-            if (first.length > 0) {
-                $(first[0]).focus();
-            }
-        });
-    };
-
-    $.fn.getAttributes = function () {
-        ///<summary>Extension method to return all of the attributes for an element</summary>
-
-        var attributes = [];
-
-        if (!this.length)
-            return this;
-
-        $.each(this[0].attributes, function (index, attr) {
-            attributes.push({ name: attr.name, value: attr.value });
-        });
-
-        return attributes;
-    };
-
-
-    //defaults that need to be set on ready
-    $(document).ready(function () {
-
-        //adds a default ignore parameter to jquery validation
-        if ($.validator) {
-            $.validator.setDefaults({ ignore: ".ignore" });
-        }
-
-        //adds a "re-parse" method to the Unobtrusive JS framework since Parse doesn't actually reparse
-        if ($.validator && $.validator.unobtrusive) {
-            $.validator.unobtrusive.reParse = function ($selector) {
-                $selector.removeData("validator");
-                $.validator.unobtrusive.parse($selector);
-            };
-        }
-
-    });
-
-    //This sets the default jquery ajax headers to include our csrf token, we
-    // need to user the beforeSend method because our token changes per user/login so
-    // it cannot be static
-    $.ajaxSetup({
-        beforeSend: function (xhr) {
-
-            function getCookie(name) {
-                var value = "; " + document.cookie;
-                var parts = value.split("; " + name + "=");
-                if (parts.length === 2)
-                  return parts.pop().split(";").shift();
-                return null;
-            }
-
-            var cookieVal = getCookie("UMB-XSRF-TOKEN");
-            if (cookieVal) {
-              xhr.setRequestHeader("X-UMB-XSRF-TOKEN", cookieVal);  
-            }
-
-            var queryString = window.location.getParams();
-            if (queryString.umbDebug === "true") {
-              xhr.setRequestHeader("X-UMB-DEBUG", cookieVal);  
-            }
-        }
-    });
-
-})(jQuery);
\ No newline at end of file
diff --git a/src/Umbraco.Web/UI/Bundles/JsUmbracoApplicationCore.cs b/src/Umbraco.Web/UI/Bundles/JsUmbracoApplicationCore.cs
index 6fa0a9a0d0..712f6e6a1d 100644
--- a/src/Umbraco.Web/UI/Bundles/JsUmbracoApplicationCore.cs
+++ b/src/Umbraco.Web/UI/Bundles/JsUmbracoApplicationCore.cs
@@ -6,7 +6,6 @@ namespace Umbraco.Web.UI.Bundles
     /// <summary>
     /// The core libs that require JQuery to be loaded
     /// </summary>
-    [ClientDependency(ClientDependencyType.Javascript, "Application/Extensions.js", "UmbracoClient", Priority = 0, Group = 2)]
     [ClientDependency(ClientDependencyType.Javascript, "Application/UmbracoApplicationActions.js", "UmbracoClient", Priority = 1, Group = 2)]
     public class JsUmbracoApplicationCore : Control
     {