Losing session in Firefox when redirect to other page

How do you call the page eg. Ajax?
Someone on the IRC had the same problem (12 days ago).

Problem was the ajax request. The request was from a other domain. Problem called Same origin policy

https://en.wikipedia.org/wiki/Same-origin_policy

Solution
http://caniuse.com/#feat=cors
http://stackoverflow.com/questions/35062...71#9523871

header("Access-Control-Allow-Origin: http://foo.example"); in the Controller. http://foo.example is the ajax site.