--- a/testing/marionette/browser.js
+++ b/testing/marionette/browser.js
@@ -28,17 +28,16 @@ const XUL_NS = "http://www.mozilla.org/k
  * @param {nsIDOMWindow} win
  *     The window whose browser needs to be accessed.
  * @param {GeckoDriver} driver
  *     Reference to the driver the browser is attached to.
  */
 browser.Context = class {
 
   constructor(win, driver) {
-    logger.info("Context ctor");
     this.browser = undefined;
     this.window = win;
     this.driver = driver;
     this.knownFrames = [];
     this.startPage = "about:blank";
     // used in B2G to identify the homescreen content page
     this.mainContentId = null;
     // used to set curFrameId upon new session

--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -276,19 +276,17 @@ GeckoDriver.prototype.addFrameCloseListe
  *
  * @param {nsIDOMWindow} win
  *     Window for which we will create a browsing context.
  *
  * @return {string}
  *     Returns the unique server-assigned ID of the window.
  */
 GeckoDriver.prototype.addBrowser = function(win) {
-  logger.info("addBrowser");
   let bc = new browser.Context(win, this);
-  logger.info("bc=" + bc);
   let winId = win.QueryInterface(Ci.nsIInterfaceRequestor)
       .getInterface(Ci.nsIDOMWindowUtils).outerWindowID;
   winId = winId + ((this.appName == "B2G") ? "-b2g" : "");
   this.browsers[winId] = bc;
   this.curBrowser = this.browsers[winId];
   if (typeof this.curBrowser.elementManager.seenItems[winId] == "undefined") {
     // add this to seenItems so we can guarantee
     // the user will get winId as this window's id