--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -3079,23 +3079,16 @@ BrowserObj.prototype.setBrowser = functi
   switch (this.driver.appName) {
     case "Firefox":
       this.browser = win.gBrowser;
       break;
 
     case "Fennec":
       this.browser = win.BrowserApp;
       break;
-
-    case "B2G":
-      // eideticker (bug 965297) and mochitest (bug 965304)
-      // compatibility.  They only check for the presence of this
-      // property and should not be in caps if not on a B2G device.
-      this.driver.sessionCapabilities.b2g = true;
-      break;
   }
 };
 
 /** Called when we start a session with this browser. */
 BrowserObj.prototype.startSession = function(newSession, win, callback) {
   callback(win, newSession);
 };