change how to submit the form to stop ff to hang, this fixes #13037

plone/app/discussion/browser/javascripts/controlpanel.js

@@ -120,7 +120,7 @@
          **********************************************************************/
         $("form#DiscussionSettingsEditForm").bind("submit", function (e) {
             $(this).find("input,select").removeAttr('disabled');
-			$(this).submit();
+            $("form#DiscussionSettingsEditForm").submit();
         });
 
     });