diff -up mozilla-esr17/browser/app/profile/firefox.js.addons mozilla-esr17/browser/app/profile/firefox.js

--- mozilla-esr17/browser/app/profile/firefox.js.addons	2012-11-29 05:43:51.000000000 +0100

+++ mozilla-esr17/browser/app/profile/firefox.js	2012-12-21 08:40:51.799335531 +0100

@@ -61,7 +61,7 @@ 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);

 // Dictionary download preference

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

diff -up mozilla-esr17/toolkit/mozapps/extensions/XPIProvider.jsm.addons mozilla-esr17/toolkit/mozapps/extensions/XPIProvider.jsm

--- mozilla-esr17/toolkit/mozapps/extensions/XPIProvider.jsm.addons	2012-11-29 05:45:08.000000000 +0100

+++ mozilla-esr17/toolkit/mozapps/extensions/XPIProvider.jsm	2012-12-21 08:40:14.342341623 +0100

@@ -1630,8 +1630,8 @@ var XPIProvider = {

       this.showUpgradeUI();

       flushCaches = true;

     }

-    else if (aAppChanged === undefined) {

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

+    else {

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

       Services.prefs.setBoolPref(PREF_SHOWN_SELECTION_UI, true);

     }