Don't let the system replace a friendly_Url by an unfriendly_Url.
E.g. there are three Friendly_Url names for the same node "Friendly_Url" (Friendly_Url_Name, FriendlyUrl) but after navigation to
Friendly_Url the browser address-line shows the Unfriendly_Url :
http://debategraph.org/Stream.aspx?nid=153573&iv=05 .