WebXMPPBlackHole

Do stuff here.

   XMPP over WebSocket

   sharing sessions across browser windows / tabs

   198-enabled session on server side and resume on client side/

   or use EXTERNAL based on TLS session

   or ticket from XMPP server

   problem

   store username and passsowrd on the client

   want to auth with account on different websites

   want steady session that comes back when you reopen the tab

   generate a prebinding token?

   two-tab problem is separate from the reload problem

   cross-tab communication in browser (W3C spec for messaging?)

   use that as transport for communication about which tab is auth'd etc.