DOM localStorage not cleared on New Identity
http://www.stevesouders.com/blog/2012/09/10/clearing-browser-data/ reveals that despite the documentation on MDC (https://developer.mozilla.org/en/DOM/Storage#Storage_location_and_clearing_the_data), window.localStorage is NOT cleared by the "cookie-changed" observer event. We need to clear it explicitly. Isn't that cute. Another evercookie vector.
Since we enabled DOM storage for FF17, this is a regression, and a pretty bad one at that.