--- a/testing/marionette/server.js
+++ b/testing/marionette/server.js
@@ -129,25 +129,25 @@ MarionetteServer.prototype.onSocketAccep
   let output = clientSocket.openOutputStream(0, 0, 0);
   let transport = new DebuggerTransport(input, output);
   let connId = "conn" + this.nextConnId++;
 
   let dispatcher = new Dispatcher(connId, transport, this.driverFactory.bind(this));
   dispatcher.onclose = this.onConnectionClosed.bind(this);
   this.conns[connId] = dispatcher;
 
-  logger.info(`Accepted connection ${connId} from ${clientSocket.host}:${clientSocket.port}`);
+  logger.debug(`Accepted connection ${connId} from ${clientSocket.host}:${clientSocket.port}`);
   dispatcher.sayHello();
   transport.ready();
 };
 
 MarionetteServer.prototype.onConnectionClosed = function(conn) {
   let id = conn.connId;
   delete this.conns[id];
-  logger.info(`Closed connection ${id}`);
+  logger.debug(`Closed connection ${id}`);
 };
 
 function isMulet() {
   try {
     return Services.prefs.getBoolPref("b2g.is_mulet");
   } catch (e) {
     return false;
   }