Unsafe JavaScript attempt to access frame with URL http://apps.facebook.com/cityville/?installed=1 http://apps.facebook.com/cityville/?installed=1 from frame wi

Unsafe JavaScript attempt to access frame with URL http://apps.facebook.com/cityville/?installed=1 http://apps.facebook.com/cityville/?installed=1 from frame with URL http://fb-0.cityville.zynga.com/flash.php?isOuterIframe=1.. http://fb-0.cityville.zynga.com/flash.php?isOuterIframe=1... INFO HERE CUT OUT]. Domains, protocols and ports must match. That's always popped up in WebKit debuggers. I think everyone that's ever developed a Facebook app wastes 20 minutes learning that they can and should ignore it.