diff -up mozilla-aurora/browser/app/profile/firefox.js.addons mozilla-aurora/browser/app/profile/firefox.js

--- mozilla-aurora/browser/app/profile/firefox.js.addons	2014-05-06 13:17:13.000000000 +0200

+++ mozilla-aurora/browser/app/profile/firefox.js	2014-05-06 14:16:32.678968008 +0200

@@ -65,7 +65,8 @@ pref("extensions.hotfix.certs.1.sha1Fing

 // Disable add-ons that are not installed by the user in all scopes by default.

 // See the SCOPE constants in AddonManager.jsm for values to use here.

-pref("extensions.autoDisableScopes", 15);

+pref("extensions.autoDisableScopes", 0);

+pref("extensions.showMismatchUI", false);

 // Dictionary download preference

 pref("browser.dictionaries.download.url", "https://addons.mozilla.org/%LOCALE%/firefox/dictionaries/");

diff -up mozilla-aurora/toolkit/mozapps/extensions/internal/XPIProvider.jsm.addons mozilla-aurora/toolkit/mozapps/extensions/internal/XPIProvider.jsm

--- mozilla-aurora/toolkit/mozapps/extensions/internal/XPIProvider.jsm.addons	2014-05-06 14:16:32.680968014 +0200

+++ mozilla-aurora/toolkit/mozapps/extensions/internal/XPIProvider.jsm	2014-05-06 14:17:29.482132549 +0200

@@ -1894,7 +1894,7 @@ this.XPIProvider = {

         this.showUpgradeUI();

         flushCaches = true;

       }

-      else if (aAppChanged === undefined) {

+      else {

         // For new profiles we will never need to show the add-on selection UI

         Services.prefs.setBoolPref(PREF_SHOWN_SELECTION_UI, true);

       }