when i am trying to copy link location of any kind of advertisement link from the facebook page it give me the long url like "http://www.facebook.com/l.php?u=http%3A%2F%2Fw2s.us%2Fmipw6q&h=QAQGCfeIi".now in earlier days when i right click on this kind of link and select option copy link location it is giving me the shrort link like "http://w2s.us/wsgpie".now i want to know that why the firefox not govong me the real website link in this situation.no major changes are done in my desktop then how this feature automatically changed?