nsINavBookmarkObserver in Firefox 3.6a1pre

 Notify this observer that an item is about to be removed.  Called before
 the actual removal will take place.

 @param aItemId
        The id of the bookmark to be removed.

 Notify this observer that a batch transaction has started.
 Other notifications will be sent during the batch change,
 but the observer is guaranteed that onEndUpdateBatch() will be called
 at the completion of changes.

 Notify this observer that a batch transaction has ended.

 Notify this observer that an item was added.  Called after the actual
 add took place. The items following the index will be shifted down, but
 no additional notifications will be sent.

 @param aItemId
        The id of the bookmark that was added.
 @param aFolder
        The folder that the item was added to.
 @param aIndex
        The item's index in the folder.

 Notify this observer that an item's information has changed.  This
 will be called whenever any attributes like "title" are changed.
 
 @param aItemId
        The id of the item that was changed.
 @param aProperty
        The property which changed.
 @param aIsAnnotationProperty
        Is aProperty the name of an item annotation

 property = "cleartime": (history was deleted, there is no last visit date):
                         value = empty string.
 property = "title": value = new title.
 property = "favicon": value = new "moz-anno" URL of favicon image
 property = "uri": value = new uri spec.
 property = "tags: (tags set for the bookmarked uri have changed)
             value = empty string.
 property = "dateAdded": value = PRTime when the item was first added
 property = "lastModified": value = PRTime when the item was last modified
 aIsAnnotationProperty = true: value = empty string.

 Notify this observer that an item has been moved.
  @param aItemId
         The id of the item that was moved.
  @param aOldParent
         The id of the old parent.
  @param aOldIndex
         The old index inside aOldParent.
  @param aNewParent
         The id of the new parent.
  @param aNewIndex
         The foindex inside aNewParent.

 Notify this observer that an item was removed.  Called after the actual
 remove took place. The items following the index will be shifted up, but
 no additional notifications will be sent.

 @param aItemId
        The id of the bookmark that was removed.
 @param aFolder
        The folder that the item was removed from.
 @param aIndex
        The bookmark's index in the folder.

 Notify that the item was visited. Normally in bookmarks we use the last
 visit date, and normally the time will be a new visit that will be more
 recent, but this is not guaranteed. You should check to see if it's
 actually more recent before using this new time.

 @param aBookmarkId
        The id of the bookmark that was visited.
 @see onItemChanged property = "cleartime" for when all visit dates are
 deleted for the URI.