servlet 剔除cookie失败

servlet 删除cookie失败
RT，在servlet的doget删除cookie时，firefox删除失败，IE和chrome删除成功，现贴上代码，希望各位大虾指教

Java code

Cookie[] cookies = request.getCookies();        for (Cookie cookie : cookies)        {            cookie.setMaxAge(0);            cookie.setPath("/");            response.addCookie(cookie);        }

------解决方案--------------------
if all other parts of code are correct, i think the reason could be the local setting of your firefox.

please let me known, if you find the solusion. thanks