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diff -up firefox-55.0/browser/app/profile/firefox.js.addons firefox-55.0/browser/app/profile/firefox.js
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--- firefox-55.0/browser/app/profile/firefox.js.addons	2017-08-02 10:58:30.566363833 +0200
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+++ firefox-55.0/browser/app/profile/firefox.js	2017-08-02 10:59:15.377216959 +0200
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@@ -65,7 +65,8 @@ pref("extensions.systemAddon.update.url"
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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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 // Scopes to scan for changes at startup.
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 pref("extensions.startupScanScopes", 0);
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