This should fix most Javascript errors.

public/js/ff/index.js

@@ -8,11 +8,13 @@
  * See the LICENSE file for details.
  */
 
+/** global: Tour, showTour, accountFrontpageUri, billCount, accountExpenseUri, accountRevenueUri */
+
 $(function () {
     "use strict";
     // do chart JS stuff.
     drawChart();
-    if (showTour) {
+    if (showTour == true) {
         $.getJSON('json/tour').done(function (data) {
             var tour = new Tour(
                 {
@@ -55,6 +57,9 @@ function getBoxAmounts() {
     "use strict";
     var boxes = ['in', 'out', 'bills-unpaid', 'bills-paid'];
     for (var x in boxes) {
+        if (!boxes.hasOwnProperty(x)) {
+            continue;
+        }
         var box = boxes[x];
         $.getJSON('json/box/' + box).done(putData).fail(failData);
     }