+ The dev menu isn't appearing. Added a try/catch to see if that would illuminate anything. It did not. Will dig in more after applying all the patches.

browser/base/content/tabcandy/app/ui.js

@@ -916,6 +916,7 @@ UIClass.prototype = {
   
   // ----------
   addDevMenu: function() {
+    try {
       var self = this;
       
       var $select = iQ('<select>')
@@ -977,6 +978,9 @@ UIClass.prototype = {
           .appendTo($select)
           .get(0);
       }
+    } catch(e) {
+      Utils.log(e);
+    }
   },
 
   // -----------