--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -302,18 +302,17 @@ GeckoDriver.prototype.addBrowser = funct
  * frame script will be loaded into it.  If isNewSession is true, we will
  * switch focus to the start frame when it registers.
  *
  * @param {nsIDOMWindow} win
  *     Window whose browser we need to access.
  * @param {boolean=false} isNewSession
  *     True if this is the first time we're talking to this browser.
  */
-GeckoDriver.prototype.startBrowser = function(win, isNewSession=false) {
-  logger.info(`startBrowser ${this.sessionId}`)
+GeckoDriver.prototype.startBrowser = function(win, isNewSession = false) {
   this.mainFrame = win;
   this.curFrame = null;
   this.addBrowser(win);
   this.curBrowser.isNewSession = isNewSession;
   this.curBrowser.startSession(isNewSession, win, this.whenBrowserStarted.bind(this));
 };
 
 /**