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	2015-03-12 13:21:14.000000000 +0100
+++ mozilla-aurora/browser/app/profile/firefox.js	2015-03-12 14:25:39.974909169 +0100
@@ -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/");