Asp.Net Session is null in ashx file

Question

If I access session variable in ashx handler through it is always null. How can I access the current user here.

public void ProcessRequest (HttpContext context) {
        context.Session[UIConstants.SessionItems.ID] = Id;
    }

Answer 1

You have to "implement" either IRequiresSessionState or IReadOnlySessionState, with former providing full access to session, and the latter providing read-only access.

I'm quoting "implement" here because these two are so-called "marker interfaces", which means they have no members.

Answer 2

However it is not working in FireFox. Is there any fix suggested for this issue?