Cookie Still Working When Browser Has Cookies Disabled?

It's weird, my firefox has cookies disabled, yet I am still able to retrieve the cookie.

Code:
protected void Page_Load(object sender, EventArgs e)
{
Response.Cookies["a"].Value = "1";
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = Request.Cookies["a"].Value.ToString(); //it returns value
}

Why is this?