diff --git a/testing/marionette/client/marionette/geckoinstance.py b/testing/marionette/client/marionette/geckoinstance.py
index 700ce81ad3f5..e289b13ba6a3 100644
--- a/testing/marionette/client/marionette/geckoinstance.py
+++ b/testing/marionette/client/marionette/geckoinstance.py
@@ -17,19 +17,19 @@ class GeckoInstance(object):
 
     required_prefs = {"marionette.defaultPrefs.enabled": True,
                       "marionette.logging": True,
-                      "startup.homepage_welcome_url": "about:blank",
-                      "browser.shell.checkDefaultBrowser": False,
-                      "browser.startup.page": 0,
-                      "browser.sessionstore.resume_from_crash": False,
-                      "browser.warnOnQuit": False,
                       "browser.displayedE10SPrompt": 5,
                       "browser.displayedE10SPrompt.1": 5,
                       "browser.displayedE10SPrompt.2": 5,
                       "browser.displayedE10SPrompt.3": 5,
                       "browser.displayedE10SPrompt.4": 5,
+                      "browser.sessionstore.resume_from_crash": False,
+                      "browser.shell.checkDefaultBrowser": False,
+                      "browser.startup.page": 0,
                       "browser.tabs.remote.autostart.1": False,
                       "browser.tabs.remote.autostart.2": False,
-                      "dom.ipc.reportProcessHangs": False}
+                      "browser.warnOnQuit": False,
+                      "dom.ipc.reportProcessHangs": False,
+                      "startup.homepage_welcome_url": "about:blank"}
 
     def __init__(self, host, port, bin, profile=None, app_args=None, symbols_path=None,
                   gecko_log=None, prefs=None):