diff --git a/browser/components/places/content/menu.xml b/browser/components/places/content/menu.xml
index 45b40ef3518f..08e5604e41dd 100644
--- a/browser/components/places/content/menu.xml
+++ b/browser/components/places/content/menu.xml
@@ -877,6 +877,9 @@
           this.invalidateContainer(aNode);
         },
 
+        containerStateChanged:
+        function PMV_containerStateChanged(aNode, aOldState, aNewState) {},
+
         invalidateContainer: function PMV_invalidateContainer(aContainer) {
           // Do nothing if the entire view is already marked un-built.
           if (!this._self.parentNode._built)
diff --git a/browser/components/places/content/toolbar.xml b/browser/components/places/content/toolbar.xml
index 9d906f924d81..3b4c47cada64 100644
--- a/browser/components/places/content/toolbar.xml
+++ b/browser/components/places/content/toolbar.xml
@@ -736,6 +736,9 @@
           this.invalidateContainer(aContainer);
         },
 
+        containerStateChanged:
+        function TV_V_containerStateChanged(aNode, aOldState, aNewState) {},
+
         invalidateContainer: function TV_V_invalidateContainer(aContainer) {
           let containerNodeElt = aContainer._DOMElement;
           NS_ASSERT(containerNodeElt, "node must have _DOMElement set");
diff --git a/browser/components/places/content/treeView.js b/browser/components/places/content/treeView.js
index cb10e2726066..3b05ccfdd56c 100644
--- a/browser/components/places/content/treeView.js
+++ b/browser/components/places/content/treeView.js
@@ -848,6 +848,9 @@ PlacesTreeView.prototype = {
     this.invalidateContainer(aNode);
   },
 
+  containerStateChanged:
+  function PTV_containerStateChanged(aNode, aOldState, aNewState) {},
+
   invalidateContainer: function PTV_invalidateContainer(aContainer) {
     NS_ASSERT(this._result, "Need to have a result to update");
     if (!this._tree)
diff --git a/toolkit/components/places/tests/unit/test_nsINavHistoryViewer.js b/toolkit/components/places/tests/unit/test_nsINavHistoryViewer.js
index 002af4cd8202..a2fd12b19062 100644
--- a/toolkit/components/places/tests/unit/test_nsINavHistoryViewer.js
+++ b/toolkit/components/places/tests/unit/test_nsINavHistoryViewer.js
@@ -108,6 +108,7 @@ var resultObserver = {
   containerClosed: function(node) {
     this.closedContainer = node;
   },
+  containerStateChanged: function (node, oldState, newState) {},
   invalidatedContainer: null,
   invalidateContainer: function(node) {    
     this.invalidatedContainer = node;