use IPython._target in window.open

IPython/html/static/edit/js/menubar.js

@@ -49,7 +49,7 b' define(['
         
         //  File
         this.element.find('#new-file').click(function () {
-            var w = window.open();
+            var w = window.open(undefined, IPython._target);
             // Create a new file in the current directory
             var parent = utils.url_path_split(editor.file_path)[0];
             editor.contents.new_untitled(parent, {type: "file"}).then(

IPython/html/static/notebook/js/kernelselector.js

@@ -272,7 +272,7 b' define(['
 
     KernelSelector.prototype.new_notebook = function (kernel_name) {
         
-        var w = window.open();
+        var w = window.open(undefined, IPython._target);
         // Create a new notebook in the same path as the current
         // notebook's path.
         var that = this;

IPython/html/static/notebook/js/menubar.js

@@ -76,7 +76,7 b' define(['
             notebook_path
         ) + "?download=" + download.toString();
         
-        var w = window.open();
+        var w = window.open(undefined, IPython._target);
         if (this.notebook.dirty) {
             this.notebook.save_notebook().then(function() {
                 w.location = url;
@@ -101,7 +101,7 b' define(['
         
         this.element.find('#open_notebook').click(function () {
             var parent = utils.url_path_split(that.notebook.notebook_path)[0];
-            window.open(utils.url_join_encode(that.base_url, 'tree', parent));
+            window.open(utils.url_join_encode(that.base_url, 'tree', parent), IPython._target);
         });
         this.element.find('#copy_notebook').click(function () {
             that.notebook.copy_notebook();

IPython/html/static/notebook/js/notebook.js

@@ -2033,7 +2033,7 b' define(function (require) {'
     Notebook.prototype.copy_notebook = function () {
         var that = this;
         var base_url = this.base_url;
-        var w = window.open();
+        var w = window.open(undefined, IPython._target);
         var parent = utils.url_path_split(this.notebook_path)[0];
         this.contents.copy(this.notebook_path, parent).then(
             function (data) {

IPython/html/static/tree/js/newnotebook.js

@@ -75,7 +75,7 b' define(['
         /** create and open a new notebook */
         var that = this;
         kernel_name = kernel_name || this.default_kernel;
-        var w = window.open();
+        var w = window.open(undefined, IPython._target);
         this.contents.new_untitled(that.notebook_path, {type: "notebook"}).then(
             function (data) {
                 var url = utils.url_join_encode(

IPython/html/static/tree/js/notebooklist.js

@@ -72,7 +72,7 b' define(['
         if (!NotebookList._bound_singletons) {
             NotebookList._bound_singletons = true;
             $('#new-file').click(function(e) {
-                var w = window.open();
+                var w = window.open(undefined, IPython._target);
                 that.contents.new_untitled(that.notebook_path || '', {type: 'file', ext: '.txt'}).then(function(data) {
                     var url = utils.url_join_encode(
                         that.base_url, 'edit', data.path

IPython/html/static/tree/js/terminallist.js

@@ -42,7 +42,7 b' define(['
     };
 
     TerminalList.prototype.new_terminal = function () {
-        var w = window.open();
+        var w = window.open(undefined, IPython._target);
         var base_url = this.base_url;
         var settings = {
             type : "POST",