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diff -up firefox-43.0/firefox-43.0/browser/app/profile/firefox.js.addons firefox-43.0/firefox-43.0/browser/app/profile/firefox.js
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--- firefox-43.0/browser/app/profile/firefox.js.addons	2015-12-10 10:18:32.942990945 +0100
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+++ firefox-43.0/browser/app/profile/firefox.js	2015-12-10 10:22:36.435169388 +0100
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@@ -71,7 +71,8 @@ pref("extensions.hotfix.certs.2.sha1Fing
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 // Disable add-ons that are not installed by the user in all scopes by default.
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 // See the SCOPE constants in AddonManager.jsm for values to use here.
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-pref("extensions.autoDisableScopes", 15);
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+pref("extensions.autoDisableScopes", 0);
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+pref("extensions.showMismatchUI", false);
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 // Require signed add-ons by default
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 pref("xpinstall.signatures.required", true);
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diff -up firefox-43.0/firefox-43.0/toolkit/mozapps/extensions/internal/XPIProvider.jsm.addons firefox-43.0/firefox-43.0/toolkit/mozapps/extensions/internal/XPIProvider.jsm
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--- firefox-43.0/toolkit/mozapps/extensions/internal/XPIProvider.jsm.addons	2015-12-08 19:06:45.000000000 +0100
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+++ firefox-43.0/toolkit/mozapps/extensions/internal/XPIProvider.jsm	2015-12-10 10:18:32.944990955 +0100
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@@ -2523,11 +2523,7 @@ this.XPIProvider = {
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       AddonManagerPrivate.markProviderSafe(this);
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-      if (aAppChanged === undefined) {
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-        // For new profiles we will never need to show the add-on selection UI
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-        Services.prefs.setBoolPref(PREF_SHOWN_SELECTION_UI, true);
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-      }
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-      else if (aAppChanged && !this.allAppGlobal &&
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+      if (aAppChanged && !this.allAppGlobal &&
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                Preferences.get(PREF_EM_SHOW_MISMATCH_UI, true)) {
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         if (!Preferences.get(PREF_SHOWN_SELECTION_UI, false)) {
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           // Flip a flag to indicate that we interrupted startup with an interactive prompt
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@@ -2547,6 +2543,9 @@ this.XPIProvider = {
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             flushCaches = true;
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           }
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         }
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+      } else {
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+        // For new profiles we will never need to show the add-on selection UI
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+        Services.prefs.setBoolPref(PREF_SHOWN_SELECTION_UI, true);
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       }
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       if (flushCaches) {