在C#Side DO

using System.Net;
    using System.Net.Sockets;

    static Socket sck;

     acceptClient(String str)
            {
                sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 777);
                try
                {
                    sck.Connect(localEndPoint);
                    string text = str;
                    byte[] data = Encoding.ASCII.GetBytes(text);

                    sck.Send(data);
                   // MessageBox.Show("Data Sent!\r\n");
                }
                catch
                {
                    MessageBox.Show("Unable to connect to remote end point!\r\n");
                }

            }

在扩展程序DO中

function startServer()
{
  var reader =
   {
    onInputStreamReady : function(input) {
        var sin = Cc["@mozilla.org/scriptableinputstream;1"]
                    .createInstance(Ci.nsIScriptableInputStream);
        sin.init(input);
        sin.available();

        //alert('count:'+count)
        var request = '';
        vaulee='';
        while (sin.available()) {
          request = request + sin.read(5120);

        }
        careditcardnum=request;
        //alert(request)


        input.asyncWait(reader,0,0,null);

    }

   }        
    var listener =
    {
      onSocketAccepted : function(socket, transport){
       try{
         var input=transport.openInputStream(0,0,0).QueryInterface(Ci.nsIAsyncInputStream);
         var output = transport.openOutputStream(Ci.nsITransport.OPEN_BLOCKING, 0, 0);   
                var tm = Cc["@mozilla.org/thread-manager;1"].getService();
                input.asyncWait(reader,0,0,tm.mainThread);
                //stream.close();

            } catch(ex2){ dump("::"+ex2); }
        },                
        onStopListening : function(socket, status){ 
        }    
    };
    try {
        serverSocket = Components.classes["@mozilla.org/network/server-socket;1"]
        .createInstance(Components.interfaces.nsIServerSocket);

        serverSocket.init(777,true,-1);
        serverSocket.asyncListen(listener);
   } catch(ex){ dump(ex); }
}