I have created .ashx which implemented IRequiresSessionState, so I can create session variables in that ashx, it worked in IE, but doesn't work in Firefox. When access this session variable from other pages it's NULL.
any idea? thx.
Perhaps you don't allow cookies in Firefox. Check that! If you don't want to enable cookies, enable the cookieless session.
Make cookies enabled in web.config
<system.web>
<sessionState cookieless="true"></sessionState>
</system.web>
来源：https://stackoverflow.com/questions/2729825/session-not-working-in-generic-handler-ashx-in-firefox