This part of things is working.

notebook/base/handlers.py

@@ -293,8 +293,12 @@ class IPythonHandler(AuthenticatedHandler):
     #---------------------------------------------------------------
     
     @property
-    def nbextensions(self):
-        return self.settings.get('nbextensions', [])
+    def nbextensions_tree(self):
+        return self.settings.get('nbextensions_tree', {})
+
+    @property
+    def nbextensions_notebook(self):
+        return self.settings.get('nbextensions_notebook', {})
     
     def get_template(self, name):
         """Return the jinja template object for a given name"""

notebook/notebook/handlers.py

@@ -22,7 +22,7 @@ class NotebookHandler(IPythonHandler):
         redirects to the '/files/' handler if the name is not given."""
         path = path.strip('/')
         cm = self.contents_manager
-        nbextensions = json.dumps(self.nbextensions)
+        nbextensions = json.dumps(self.nbextensions_notebook)
         
         # will raise 404 on not found
         try:

notebook/notebookapp.py

@@ -220,6 +220,8 @@ class NotebookWebApplication(web.Application):
             rate_limit_window=ipython_app.rate_limit_window,
 
             nbextensions=ipython_app.nbextensions,
+            nbextensions_tree=ipython_app.nbextensions_tree,
+            nbextensions_notebook=ipython_app.nbextensions_notebook,
             
             # authentication
             cookie_secret=ipython_app.cookie_secret,
@@ -693,8 +695,11 @@ class NotebookApp(JupyterApp):
             path.append(os.path.join(get_ipython_dir(), 'nbextensions'))
         return path
 
-    nbextensions = List(Unicode(), config=True,
-        help="A list of nbextensions to enable.")
+    nbextensions_tree = Dict(config=True,
+        help="A list of nbextensions to enable for the tree/dashboard page.")
+
+    nbextensions_notebook = Dict(config=True,
+        help="A list of nbextensions to enable for the notebook page.")
 
     websocket_url = Unicode("", config=True,
         help="""The base URL for websockets,

notebook/static/base/js/utils.js

@@ -45,11 +45,27 @@ define([
      * @return {Promise} that resolves to a list of loaded module handles.
      */
     var load_extensions = function () {
+        console.log('load_extensions', arguments);
         return Promise.all(Array.prototype.map.call(arguments, load_extension)).catch(function(err) {
             console.error("Failed to load extension" + (err.requireModules.length>1?'s':'') + ":", err.requireModules, err);
         });
     };
 
+    /**
+     * Return a list of extensions that should be active
+     * The config for nbextensions comes in as a dict where keys are 
+     * nbextensions paths and the values are a bool indicating if it 
+     * should be active. This returns a list of nbextension paths
+     * where the value is true
+     */
+    function filter_extensions(nbext_config) {
+        var active = [];
+        Object.keys(nbext_config).forEach(function (nbext) {
+            if (nbext_config[nbext]) {active.push(nbext);}
+        });
+        return active;
+    }
+
     /**
      * Wait for a config section to load, and then load the extensions specified
      * in a 'load_extensions' key inside it.
@@ -57,9 +73,8 @@ define([
     function load_extensions_from_config(section) {
         section.loaded.then(function() {
             if (section.data.load_extensions) {
-                var nbextension_paths = Object.getOwnPropertyNames(
-                                            section.data.load_extensions);
-                load_extensions.apply(this, nbextension_paths);
+                var active = filter_extensions(section.data.load_extensions);
+                load_extensions.apply(this, active);
             }
         });
     }
@@ -842,6 +857,7 @@ define([
     var utils = {
         load_extension: load_extension,
         load_extensions: load_extensions,
+        filter_extensions: filter_extensions,
         load_extensions_from_config: load_extensions_from_config,
         regex_split : regex_split,
         uuid : uuid,

notebook/static/notebook/js/main.js

@@ -66,6 +66,8 @@ require([
     // compat with old IPython, remove for IPython > 3.0
     window.CodeMirror = CodeMirror;
 
+    // Setup all of the config related things
+    
     var common_options = {
         ws_url : utils.get_body_data("wsUrl"),
         base_url : utils.get_body_data("baseUrl"),
@@ -77,6 +79,11 @@ require([
     config_section.load();
     var common_config = new configmod.ConfigSection('common', common_options);
     common_config.load();
+    
+    var nbextensions = $('body').data('nbextensions');
+
+    // Instantiate the main objects
+    
     var page = new page.Page();
     var pager = new pager.Pager('div#pager', {
         events: events});
@@ -179,7 +186,10 @@ require([
       enumerable: true,
       configurable: false
     });
-
+    
+    // Now actually load nbextensions
+    var active = utils.filter_extensions(nbextensions);
+    utils.load_extensions.apply(null, active);
     utils.load_extensions_from_config(config_section);
     utils.load_extensions_from_config(common_config);
     notebook.load_notebook(common_options.notebook_path);

notebook/static/tree/js/main.js

@@ -32,10 +32,8 @@ require([
     "use strict";
     requirejs(['custom/custom'], function() {});
 
-    IPython.NotebookList = notebooklist.NotebookList;
+    // Setup all of the config related things
 
-    page = new page.Page();
-    
     var common_options = {
         base_url: utils.get_body_data("baseUrl"),
         notebook_path: utils.get_body_data("notebookPath"),
@@ -46,6 +44,12 @@ require([
     var common_config = new config.ConfigSection('common', common_options);
     common_config.load();
 
+    var nbextensions = $('body').data('nbextensions');
+
+    // Instantiate the main objects
+
+    page = new page.Page();
+
     var session_list = new sesssionlist.SesssionList($.extend({
         events: events},
         common_options));
@@ -53,6 +57,7 @@ require([
         base_url: common_options.base_url,
         common_config: common_config
     });
+    IPython.NotebookList = notebooklist.NotebookList;
     var notebook_list = new notebooklist.NotebookList('#notebook_list', $.extend({
         contents: contents,
         session_list:  session_list},
@@ -141,6 +146,10 @@ require([
     IPython.new_notebook_widget = new_buttons;
 
     events.trigger('app_initialized.DashboardApp');
+    
+    // Now actually load nbextensions
+    var active = utils.filter_extensions(nbextensions);
+    utils.load_extensions.apply(null, active);
     utils.load_extensions_from_config(cfg);
     utils.load_extensions_from_config(common_config);
     

notebook/templates/tree.html

@@ -8,7 +8,7 @@
 data-base-url="{{base_url | urlencode}}"
 data-notebook-path="{{notebook_path | urlencode}}"
 data-terminals-available="{{terminals_available}}"
-
+data-nbextensions="{{nbextensions}}"
 {% endblock %}
 
 

notebook/tree/handlers.py

@@ -3,6 +3,7 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
+import json
 from tornado import web
 from ..base.handlers import IPythonHandler, path_regex
 from ..utils import url_path_join, url_escape
@@ -37,6 +38,8 @@ class TreeHandler(IPythonHandler):
     def get(self, path=''):
         path = path.strip('/')
         cm = self.contents_manager
+        nbextensions = json.dumps(self.nbextensions_tree)
+        
         if cm.dir_exists(path=path):
             if cm.is_hidden(path):
                 self.log.info("Refusing to serve hidden directory, via 404 Error")
@@ -48,6 +51,7 @@ class TreeHandler(IPythonHandler):
                 notebook_path=path,
                 breadcrumbs=breadcrumbs,
                 terminals_available=self.settings['terminals_available'],
+                nbextensions=nbextensions
             ))
         elif cm.file_exists(path):
             # it's not a directory, we have redirecting to do