--- comm/mail/app/profile/all-thunderbird.js.old	2011-11-21 11:20:08.000000000 +0100
+++ comm/mail/app/profile/all-thunderbird.js	2011-12-14 12:40:24.074179826 +0100
@@ -138,7 +138,7 @@ pref("extensions.update.autoUpdateDefaul
 // Disable add-ons installed into the shared user and shared system areas by
 // default. This does not include the application directory. See the SCOPE
 // constants in AddonManager.jsm for values to use here
-pref("extensions.autoDisableScopes", 15);
+pref("extensions.autoDisableScopes", 3);
 
 // Enable add-ons installed and owned by the application, like the default theme.
 pref("extensions.startupScanScopes", 4);
--- comm/suite/app/profile/suite-prefs.js~	2013-11-06 19:54:38.789734061 +0100
+++ comm/suite/app/profile/suite-prefs.js	2013-11-06 20:55:33.765611935 +0100
@@ -616,7 +616,7 @@
 
 // Disable add-ons installed into the shared user and shared system areas by
 // default. See the SCOPE constants in AddonManager.jsm for values to use here.
-pref("extensions.autoDisableScopes", 11);
+pref("extensions.autoDisableScopes", 3);
 
 // Enable add-ons installed and owned by the application, like the default theme.
 pref("extensions.startupScanScopes", 4);
--- browser/app/profile/firefox.js~	2013-10-29 02:20:40.000000000 +0100
+++ browser/app/profile/firefox.js	2013-11-06 20:56:58.633092070 +0100
@@ -62,7 +62,7 @@
 
 // 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", 3);
 // Scopes to scan for changes at startup.
 pref("extensions.startupScanScopes", 0);