mini profiler in back office now enabled with query string

src/Umbraco.Web.UI/umbraco/Views/Default.cshtml

@@ -1,4 +1,5 @@
-@using System.Web.Mvc.Html
+@using System.Net.Http
+@using System.Web.Mvc.Html
 @using Umbraco.Core
 @using ClientDependency.Core
 @using ClientDependency.Core.Mvc
@@ -63,7 +64,23 @@
     <script type="text/javascript" src="lib/lazyload/lazyload.min.js"></script>
     <script type="text/javascript" src="@Url.GetUrlWithCacheBust("Application", "BackOffice")"></script>
     
-    @Html.RenderProfiler()
+    @{
+        var isDebug = false;
+        if (Request.RawUrl.IndexOf('?') >= 0)
+        {
+            var parsed = HttpUtility.ParseQueryString(Request.RawUrl.Split('?')[1]);
+            var attempt = parsed["umbDebug"].TryConvertTo<bool>();
+            if (attempt && attempt.Result)
+            {
+                isDebug = true;
+            } 
+        }
+        
+    }
+    @if (isDebug)
+    {
+        @Html.RenderProfiler()
+    }
 
 </body>
 </html>