Returns

From fuelIBookmarkFolder

 Adds a new child bookmark to this folder.
 @param   aTitle
          The title of bookmark.
 @param   aURI
          The uri of bookmark.
fuelIBookmark addBookmark(in AString aTitle, in nsIURI aURI) 
 Adds a new child separator to this folder.
fuelIBookmark addSeparator()