It would be great if the actual game url was displayed in the browser's address bar. That way if someone has to reload because of connection (or some other issues) they automatically get to the active game.
It wouldn't be hard to implement using the HTML5 history API, which is supported by all major browsers. (http://caniuse.com/#feat=history
on loading a new game.
(One could even listen to the popstate event and make the browser's back button work properly. :)
Edited 1/26/2014 19:20:44