diff --git a/IPython/html/services/contents/handlers.py b/IPython/html/services/contents/handlers.py
index ea33f17..121e325 100644
--- a/IPython/html/services/contents/handlers.py
+++ b/IPython/html/services/contents/handlers.py
@@ -62,7 +62,7 @@ class ContentsHandler(IPythonHandler):
         if type_ not in {None, 'directory', 'file', 'notebook'}:
             raise web.HTTPError(400, u'Type %r is invalid' % type_)
 
-        format = self.get_query_argument('format', default=None)#
+        format = self.get_query_argument('format', default=None)
         if format not in {None, 'text', 'base64'}:
             raise web.HTTPError(400, u'Format %r is invalid' % format)
 
diff --git a/IPython/html/static/services/config.js b/IPython/html/static/services/config.js
index a3632f7..139a02a 100644
--- a/IPython/html/static/services/config.js
+++ b/IPython/html/static/services/config.js
@@ -6,6 +6,7 @@ define([
     'base/js/utils',
     ],
 function($, utils) {
+    "use strict";
     var ConfigSection = function(section_name, options) {
         this.section_name = section_name;
         this.base_url = options.base_url;
diff --git a/IPython/html/static/services/contents.js b/IPython/html/static/services/contents.js
index f9bb1a2..768bdd4 100644
--- a/IPython/html/static/services/contents.js
+++ b/IPython/html/static/services/contents.js
@@ -6,6 +6,7 @@ define([
     'jquery',
     'base/js/utils',
 ], function(IPython, $, utils) {
+    "use strict";
     var Contents = function(options) {
         /**
          * Constructor
@@ -90,7 +91,7 @@ define([
             dataType : "json",
         };
         var url = this.api_url(path);
-        params = {};
+        var params = {};
         if (options.type) { params.type = options.type; }
         if (options.format) { params.format = options.format; }
         return utils.promising_ajax(url + '?' + $.param(params), settings);