Avoid loading container urls. Bug #6776. Fix from rjc. Approved by chofmann.

rdf/resources/bookmarks.js

@@ -46,8 +46,7 @@ function BookmarkProperties()
 
 function OpenURL(event,node)
 {
-  if (node.getAttribute('type') !=
-      "http://home.netscape.com/NC-rdf#Bookmark") {
+  if (node.getAttribute('container') == "true") {
     return false;
   }
   url = node.getAttribute('id');