diff --git a/toolkit/content/globalOverlay.js b/toolkit/content/globalOverlay.js
index 1fc1ba256104..bee39139c737 100644
--- a/toolkit/content/globalOverlay.js
+++ b/toolkit/content/globalOverlay.js
@@ -66,159 +66,86 @@ function goQuitApplication()
   return true;
 }
 
-/**
- * Command Updater
- */
-var CommandUpdater = {
-  /**
-   * Gets a controller that can handle a particular command. 
-   * @param   command
-   *          A command to locate a controller for, preferring controllers that
-   *          show the command as enabled.
-   * @returns In this order of precedence:
-   *            - the first controller supporting the specified command 
-   *              associated with the focused element that advertises the
-   *              command as ENABLED
-   *            - the first controller supporting the specified command 
-   *              associated with the global window that advertises the
-   *              command as ENABLED
-   *            - the first controller supporting the specified command
-   *              associated with the focused element
-   *            - the first controller supporting the specified command
-   *              associated with the global window
-   */
-  _getControllerForCommand: function(command) {
-    try {
-      var controller = 
-          top.document.commandDispatcher.getControllerForCommand(command);
-      if (controller && controller.isCommandEnabled(command))
-        return controller;
-    }
-    catch(e) {
-    }
-    var controllerCount = window.controllers.getControllerCount();
-    for (var i = 0; i < controllerCount; ++i) {
-      var current = window.controllers.getControllerAt(i);
-      try {
-        if (current.supportsCommand(command) && current.isCommandEnabled(command))
-          return current;
-      }
-      catch (e) {
-      }
-    }
-    return controller || window.controllers.getControllerForCommand(command);
-  },
-  
-  /**
-   * Updates the state of a XUL <command> element for the specified command
-   * depending on its state.
-   * @param   command
-   *          The name of the command to update the XUL <command> element for
-   */
-  updateCommand: function(command) {
+//
+// Command Updater functions
+//
+function goUpdateCommand(aCommand)
+{
+  try {
+    var controller = top.document.commandDispatcher
+                        .getControllerForCommand(aCommand);
+
     var enabled = false;
-    try {
-      var controller = this._getControllerForCommand(command);
-      if (controller)
-        enabled = controller.isCommandEnabled(command);
-    }
-    catch(ex) { }
+    if (controller)
+      enabled = controller.isCommandEnabled(aCommand);
 
-    this.enableCommand(command, enabled);
-  },
-  
-  /**
-   * Enables or disables a XUL <command> element.
-   * @param   command
-   *          The name of the command to enable or disable
-   * @param   enabled
-   *          true if the command should be enabled, false otherwise.
-   */
-  enableCommand: function(command, enabled) {
-    var element = document.getElementById(command);
-    if (!element)
-      return;
-    if (enabled)
-      element.removeAttribute("disabled");
+    goSetCommandEnabled(aCommand, enabled);
+  }
+  catch (e) {
+    dump("An error occurred updating the " + aCommand + " command\n");
+  }
+}
+
+function goDoCommand(aCommand)
+{
+  try {
+    var controller = top.document.commandDispatcher
+                        .getControllerForCommand(aCommand);
+    if (controller && controller.isCommandEnabled(aCommand))
+      controller.doCommand(aCommand);
+  }
+  catch (e) {
+    dump("An error occurred executing the " + aCommand + " command\n" + e + "\n");
+  }
+}
+
+
+function goSetCommandEnabled(aID, aEnabled)
+{
+  var node = document.getElementById(aID);
+
+  if (node) {
+    if (aEnabled)
+      node.removeAttribute("disabled");
     else
-      element.setAttribute("disabled", "true");
-  },
+      node.setAttribute("disabled", "true");
+  }
+}
 
-  /**
-   * Performs the action associated with a specified command using the most
-   * relevant controller.
-   * @param   command
-   *          The command to perform.
-   */
-  doCommand: function(command) {
-    var controller = this._getControllerForCommand(command);
-    if (!controller)
-      return;
-    controller.doCommand(command);
-  }, 
-  
-  /**
-   * Changes the label attribute for the specified command.
-   * @param   command
-   *          The command to update.
-   * @param   labelAttribute
-   *          The label value to use.
-   */
-  setMenuValue: function(command, labelAttribute) {
-    var commandNode = top.document.getElementById(command);
-    if (commandNode)
-    {
-      var label = commandNode.getAttribute(labelAttribute);
-      if ( label )
-        commandNode.setAttribute('label', label);
-    }
-  },
-  
-  /**
-   * Changes the accesskey attribute for the specified command.
-   * @param   command
-   *          The command to update.
-   * @param   valueAttribute
-   *          The value attribute to use.
-   */
-  setAccessKey: function(command, valueAttribute) {
-    var commandNode = top.document.getElementById(command);
-    if (commandNode)
-    {
-      var value = commandNode.getAttribute(valueAttribute);
-      if ( value )
-        commandNode.setAttribute('accesskey', value);
-    }
-  },
+function goSetMenuValue(aCommand, aLabelAttribute)
+{
+  var commandNode = top.document.getElementById(aCommand);
+  if (commandNode) {
+    var label = commandNode.getAttribute(aLabelAttribute);
+    if (label)
+      commandNode.setAttribute("label", label);
+  }
+}
 
-  /**
-   * Inform all the controllers attached to a node that an event has occurred
-   * (e.g. the tree controllers need to be informed of blur events so that they can change some of the
-   * menu items back to their default values)
-   * @param   node
-   *          The node receiving the event
-   * @param   event
-   *          The event.
-   */
-  onEvent: function(node, event) {
-    var numControllers = node.controllers.getControllerCount();
-    var controller;
+function goSetAccessKey(aCommand, aValueAttribute)
+{
+  var commandNode = top.document.getElementById(aCommand);
+  if (commandNode) {
+    var value = commandNode.getAttribute(aValueAttribute);
+    if (value)
+      commandNode.setAttribute("accesskey", value);
+  }
+}
 
-    for ( var controllerIndex = 0; controllerIndex < numControllers; controllerIndex++ )
-    {
-      controller = node.controllers.getControllerAt(controllerIndex);
-      if ( controller )
-        controller.onEvent(event);
-    }
-  }  
-};
-// Shim for compatibility with existing code. 
-function goDoCommand(command) { CommandUpdater.doCommand(command); }
-function goUpdateCommand(command) { CommandUpdater.updateCommand(command); }
-function goSetCommandEnabled(command, enabled) { CommandUpdater.enableCommand(command, enabled); }
-function goSetMenuValue(command, labelAttribute) { CommandUpdater.setMenuValue(command, labelAttribute); }
-function goSetAccessKey(command, valueAttribute) { CommandUpdater.setAccessKey(command, valueAttribute); }
-function goOnEvent(node, event) { CommandUpdater.onEvent(node, event); }
+// this function is used to inform all the controllers attached to a node that an event has occurred
+// (e.g. the tree controllers need to be informed of blur events so that they can change some of the
+// menu items back to their default values)
+function goOnEvent(node, aEvent)
+{
+  var numControllers = aNode.controllers.getControllerCount();
+  var controller;
+
+  for (var controllerIndex = 0; controllerIndex < numControllers; controllerIndex++) {
+    controller = aNode.controllers.getControllerAt(controllerIndex);
+    if (controller)
+      controller.onEvent(aEvent);
+  }
+}
 
 function visitLink(aEvent) {
   var node = aEvent.target;