diff --git a/.gitignore b/.gitignore
index 6397bfe93..af4aaade4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,7 @@ src
 notebook/static/auth/js/main.bundle.js
 notebook/static/edit/js/main.bundle.js
 notebook/static/notebook/js/main.bundle.js
+notebook/static/services/contents.bundle.js
 notebook/static/terminal/js/main.bundle.js
 notebook/static/tree/js/main.bundle.js
 
diff --git a/notebook/base/handlers.py b/notebook/base/handlers.py
index 75805955c..cd3241fad 100644
--- a/notebook/base/handlers.py
+++ b/notebook/base/handlers.py
@@ -172,8 +172,8 @@ class IPythonHandler(AuthenticatedHandler):
     @property
     def contents_js_source(self):
         self.log.debug("Using contents: %s", self.settings.get('contents_js_source',
-            'services/contents'))
-        return self.settings.get('contents_js_source', 'services/contents')
+            'services/contents.bundle'))
+        return self.settings.get('contents_js_source', 'services/contents.bundle')
     
     #---------------------------------------------------------------
     # Manager objects
diff --git a/notebook/build.js b/notebook/build.js
index 63e79182a..2e885e008 100644
--- a/notebook/build.js
+++ b/notebook/build.js
@@ -26,6 +26,5 @@ var b = browserify({
 });
 
 b.transform(aliasify, aliasifyConfig);
-b.exclude('contents');
 b.add(__dirname + '/static/' + process.argv[2]);
 b.bundle().pipe(fs.createWriteStream(__dirname + '/static/' + process.argv[3]));
diff --git a/notebook/static/base/js/utils.js b/notebook/static/base/js/utils.js
index 67a090403..0a1ac5c28 100644
--- a/notebook/static/base/js/utils.js
+++ b/notebook/static/base/js/utils.js
@@ -15,7 +15,7 @@
      */
     var load_extension = function (extension) {
         return new Promise(function(resolve, reject) {
-            require(["nbextensions/" + extension], function(module) {
+            requirejs(["nbextensions/" + extension], function(module) {
                 console.log("Loaded extension: " + extension);
                 try {
                     module.load_ipython_extension();
diff --git a/notebook/static/edit/js/main.js b/notebook/static/edit/js/main.js
index 8ff17620a..eac072379 100644
--- a/notebook/static/edit/js/main.js
+++ b/notebook/static/edit/js/main.js
@@ -1,13 +1,14 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-            
-    "use strict";
+"use strict";
+
+// Contents must be loaded at runtime.
+requirejs(['contents'], function(contents_service) {
     var $ = require('jquery');
     var IPython = require('base/js/namespace');
     var utils = require('base/js/utils');
     var page = require('base/js/page');
     var events = require('base/js/events');
-    var contents = require('contents');
     var configmod = require('services/config');
     var editmod = require('edit/js/editor');
     var menubar = require('edit/js/menubar');
@@ -81,3 +82,4 @@
 
     // On document ready, resize codemirror.
     $(document).ready(_handle_resize);
+});
diff --git a/notebook/static/notebook/js/main.js b/notebook/static/notebook/js/main.js
index e681cdfce..c5b17503b 100644
--- a/notebook/static/notebook/js/main.js
+++ b/notebook/static/notebook/js/main.js
@@ -1,58 +1,12 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
+"use strict";
 
-require([
-    'base/js/namespace',
-    'jquery',
-    'notebook/js/notebook',
-    'contents',
-    'services/config',
-    'base/js/utils',
-    'base/js/page',
-    'base/js/events',
-    'auth/js/loginwidget',
-    'notebook/js/maintoolbar',
-    'notebook/js/pager',
-    'notebook/js/quickhelp',
-    'notebook/js/menubar',
-    'notebook/js/notificationarea',
-    'notebook/js/savewidget',
-    'notebook/js/actions',
-    'notebook/js/keyboardmanager',
-    'notebook/js/kernelselector',
-    'codemirror/lib/codemirror',
-    'notebook/js/about',
-    'typeahead',
-
-require([
-    'base/js/namespace',
-    'jquery',
-    'notebook/js/notebook',
-    'contents',
-    'services/config',
-    'base/js/utils',
-    'base/js/page',
-    'base/js/events',
-    'auth/js/loginwidget',
-    'notebook/js/maintoolbar',
-    'notebook/js/pager',
-    'notebook/js/quickhelp',
-    'notebook/js/menubar',
-    'notebook/js/notificationarea',
-    'notebook/js/savewidget',
-    'notebook/js/actions',
-    'notebook/js/keyboardmanager',
-    'notebook/js/kernelselector',
-    'codemirror/lib/codemirror',
-    'notebook/js/about',
-    'typeahead',
-    'notebook/js/searchandreplace',
-    "use strict";
-        
+// Contents must be loaded at runtime.
+requirejs(['contents'], function(contents_service) {
     var IPython = require('base/js/namespace');
     var $ = require('jquery');
     var notebook = require('notebook/js/notebook');
-    var contents = require('contents');
     var configmod = require('services/config');
     var utils = require('base/js/utils');
     var page = require('base/js/page');
@@ -187,3 +141,4 @@ require([
     utils.load_extensions_from_config(config_section);
     utils.load_extensions_from_config(common_config);
     notebook.load_notebook(common_options.notebook_path);
+});
diff --git a/notebook/static/services/contents.js b/notebook/static/services/contents.js
index a1c5fe1c7..8f9bc7f45 100644
--- a/notebook/static/services/contents.js
+++ b/notebook/static/services/contents.js
@@ -251,3 +251,5 @@
     };
 
     exports.Contents = Contents;
+    
+    window.define([], function() { return {Contents: Contents}; })
diff --git a/notebook/static/tree/js/main.js b/notebook/static/tree/js/main.js
index 644ffd7df..ec9ea6c36 100644
--- a/notebook/static/tree/js/main.js
+++ b/notebook/static/tree/js/main.js
@@ -1,6 +1,9 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
-    "use strict";
+"use strict";
+
+// Contents must be loaded at runtime.
+requirejs(['contents'], function(contents_service) {
 
     var $ = require('jquery');
     var IPython = require('base/js/namespace');
@@ -9,7 +12,6 @@
     var page = require('base/js/page');
     var utils = require('base/js/utils');
     var config = require('services/config');
-    var contents_service = require('contents');
     var notebooklist = require('tree/js/notebooklist');
     var sesssionlist = require('tree/js/sessionlist');
     var kernellist = require('tree/js/kernellist');
@@ -20,7 +22,7 @@
     require('jqueryui');
     require('bootstrap');
     require('custom/custom');
-
+    
     IPython.NotebookList = notebooklist.NotebookList;
 
     page = new page.Page();
@@ -158,3 +160,4 @@
     if (window.location.hash) {
         $("#tabs").find("a[href=" + window.location.hash + "]").click();
     }
+});
diff --git a/package.json b/package.json
index 9190cac87..c40b83a69 100644
--- a/package.json
+++ b/package.json
@@ -15,8 +15,9 @@
     "build:css": "concurrent \"npm run build:css:ipython\" \"npm run build:css:style\"",
     "build:css:ipython": "lessc --source-map --include-path=./notebook/static/ ./notebook/static/style/ipython.less ./notebook/static/style/ipython.min.css",
     "build:css:style": "lessc --source-map --include-path=./notebook/static/ ./notebook/static/style/style.less ./notebook/static/style/style.min.css",
-    "build:js": "concurrent \"npm run build:js:tree\" \"npm run build:js:terminal\" \"npm run build:js:notebook\" \"npm run build:js:edit\" \"npm run build:js:auth\"",
+    "build:js": "concurrent \"npm run build:js:tree\" \"npm run build:js:terminal\" \"npm run build:js:notebook\" \"npm run build:js:edit\" \"npm run build:js:auth\" \"npm run build:js:contents\"",
     "build:js:notebook": "node ./notebook/build.js notebook/js/main.js notebook/js/main.bundle.js",
+    "build:js:contents": "node ./notebook/build.js services/contents.js services/contents.bundle.js",
     "build:js:edit": "node ./notebook/build.js edit/js/main.js edit/js/main.bundle.js",
     "build:js:tree": "node ./notebook/build.js tree/js/main.js tree/js/main.bundle.js",
     "build:js:auth": "node ./notebook/build.js auth/js/main.js auth/js/main.bundle.js",