diff -up firefox-54.0/browser/app/profile/firefox.js.addons firefox-54.0/browser/app/profile/firefox.js
--- firefox-54.0/browser/app/profile/firefox.js.addons	2017-06-08 13:59:20.504220317 +0200
+++ firefox-54.0/browser/app/profile/firefox.js	2017-06-08 14:01:54.388653599 +0200
@@ -66,7 +66,8 @@ pref("extensions.screenshots.system-disa
 
 // 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);
 
 // Add-on content security policies.
 pref("extensions.webextensions.base-content-security-policy", "script-src 'self' https://* moz-extension: blob: filesystem: 'unsafe-eval' 'unsafe-inline'; object-src 'self' https://* moz-extension: blob: filesystem:;");