I've implemented this and it works as expected in Firefox (no delay, notifications are 1 or 2 seconds of latency at most from send time). Be ready to do lots o

I've implemented this and it works as expected in Firefox (no delay, notifications are 1 or 2 seconds of latency at most from send time). Be ready to do lots of debugging to implement this though -- its far from straightforward and overly complicated IMO.