In the class nsDocShellTreeOwner, in file nsDocShellTreeOwner.cpp, the class data member mOwnerProgressListener is not intialized in the constructor. If the person using the API neglects to call nsDocShellTreeOwner::SetWebBrowserChrome (which intializes mOwnerProgressListener), Bad Things will happen
setting bug status to New
verified (now init to nsnull in the constructor)
Adding keyword to bugs which already show a nsbeta2 triage value in the status whiteboard so the queries don't get screwed up.