diff --git a/toolkit/components/places/public/nsINavBookmarksService.idl b/toolkit/components/places/public/nsINavBookmarksService.idl
index d1645806261..7c209e52891 100644
--- a/toolkit/components/places/public/nsINavBookmarksService.idl
+++ b/toolkit/components/places/public/nsINavBookmarksService.idl
@@ -120,6 +120,15 @@ interface nsINavBookmarkObserver : nsISupports
    */
   void onItemChanged(in nsIURI bookmark, in ACString property);
 
+  /**
+   * Notify this observer that a bookmark has been replaced.
+   *
+   * @param folder   The folder in which the bookmark was replaced
+   * @param item     The item which was replaced
+   * @param newItem  The new item which replaced item
+   */
+  void onItemReplaced(in PRInt64 folder, in nsIURI item, in nsIURI newItem);
+
   /**
    * Notify this observer that a bookmark folder has been added.
    *  @param folder     The id of the folder that was added.
@@ -196,6 +205,14 @@ interface nsINavBookmarksService : nsISupports
    */
   void removeItem(in PRInt64 folder, in nsIURI child);
 
+  /**
+   * Replace an item with a different item.
+   *  @param folder     The folder which contains the item to replace
+   *  @param item       The item which should be replaced
+   *  @param newItem    The new item
+   */
+  void replaceItem(in PRInt64 folder, in nsIURI item, in nsIURI newItem);
+
   /**
    * Creates a new child folder and inserts it under the given parent.
    *  @param parent     The id of the parent folder