Fix namespace clash

content/completion.js

@@ -954,7 +954,7 @@ function Completion() //{{{
             return [0, this.filter(res, filter)];
         },
 
-        history: function history(filter) [0, history.get(filter)],
+        history: function _history(filter) [0, history.get(filter)],
 
         get javascriptCompleter() javascript,
 

content/ui.js

@@ -784,7 +784,7 @@ function CommandLine() //{{{
                         else if (historyIndex >= inputHistory.length + 1)
                         {
                             historyIndex = inputHistory.length;
-                            beep();
+                            liberator.beep();
                             break;
                         }