Swfupload + FireFox +. Net2.0 unable to work, I was the problem for a long time, almost to give up

But I have a chance to discover the reasons leading to this problem

Solution:
In Global.asax file
string session_cookie_name = "ASP.NET_SESSIONID"
Amended to
string session_cookie_name = "ASP.NET_SessionId";

Well,try it again