git-svn-id: svn://10.0.0.236/branches/DOM_AGNOSTIC_BRANCH@181846 18797224-902f-48f8-a5cc-f745e15eee43
own nsISupports wrapper, which has support in context.py for expandos, and all object returned by these objects are also this custom object. git-svn-id: svn://10.0.0.236/branches/DOM_AGNOSTIC_BRANCH@181687 18797224-902f-48f8-a5cc-f745e15eee43