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diff -up mozilla-aurora/browser/app/profile/firefox.js.addons mozilla-aurora/browser/app/profile/firefox.js
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--- mozilla-aurora/browser/app/profile/firefox.js.addons	2015-03-12 13:21:14.000000000 +0100
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+++ mozilla-aurora/browser/app/profile/firefox.js	2015-03-12 14:25:39.974909169 +0100
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@@ -65,7 +65,8 @@ pref("extensions.hotfix.certs.1.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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 // Dictionary download preference
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 pref("browser.dictionaries.download.url", "https://addons.mozilla.org/%LOCALE%/firefox/dictionaries/");