--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -275,26 +275,24 @@ GeckoDriver.prototype.QueryInterface = X
   Ci.nsIMessageListener,
   Ci.nsIObserver,
   Ci.nsISupportsWeakReference,
 ]);
 
 GeckoDriver.prototype.init = function() {
   this.mm.addMessageListener("Marionette:WebDriver:GetCapabilities", this);
   this.mm.addMessageListener("Marionette:GetLogLevel", this);
-  this.mm.addMessageListener("Marionette:getVisibleCookies", this);
   this.mm.addMessageListener("Marionette:ListenersAttached", this);
   this.mm.addMessageListener("Marionette:Register", this);
   this.mm.addMessageListener("Marionette:switchedToFrame", this);
 };
 
 GeckoDriver.prototype.uninit = function() {
   this.mm.removeMessageListener("Marionette:WebDriver:GetCapabilities", this);
   this.mm.removeMessageListener("Marionette:GetLogLevel", this);
-  this.mm.removeMessageListener("Marionette:getVisibleCookies", this);
   this.mm.removeMessageListener("Marionette:ListenersAttached", this);
   this.mm.removeMessageListener("Marionette:Register", this);
   this.mm.removeMessageListener("Marionette:switchedToFrame", this);
 };
 
 /**
  * Callback used to observe the creation of new modal or tab modal dialogs
  * during the session's lifetime.