Interaction between Applet, Cookie e ASP.net doesn't works in Firefox

    private void getUserNameFromCookie() {
        try {
            // get the cookies that are applicable for this applet's parent web page
            URL docBaseUrl = this.getDocumentBase();

            CookieHandler cookieHandler = CookieHandler.getDefault();
            java.util.Map<String, List<String>> headers =
                    cookieHandler.get(docBaseUrl.toURI(),
                    new HashMap<String, List<String>>());

            if (headers.isEmpty()) {
                System.out.println("No cookies found!");
            } else {
                getUserNameFromHeader(headers);
            }
        } catch (Exception e) {
            System.out.println("Unable to get cookie using CookieHandler");
            e.printStackTrace();
        }
    }

    private void getUserNameFromHeader(java.util.Map<String, List<String>> headers) {

        for (String key : headers.keySet()) {
            for (String value : headers.get(key)) {
                if (key.equals("Cookie") && value.startsWith("userName")) {
                    userName = value.split("=")[1];
                }
            }
        }
    }

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            HttpCookie appCookie = new HttpCookie("userName");
            appCookie.Value = Session["user"].ToString();

            appCookie.Expires = DateTime.Now.AddDays(1);
            appCookie.HttpOnly = false;
            Response.Cookies.Add(appCookie);

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