diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
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index 4e40cfa..b44ec96 100644
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--- a/modules/libpref/src/init/all.js
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+++ b/modules/libpref/src/init/all.js
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@@ -1024,7 +1024,7 @@ pref("intl.charsetmenu.browser.cache.size", 5);
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pref("intl.charset.detector", "chrome://global/locale/intl.properties");
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pref("intl.charset.default", "chrome://global-platform/locale/intl.properties");
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pref("intl.ellipsis", "chrome://global-platform/locale/intl.properties");
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-pref("intl.locale.matchOS", false);
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+pref("intl.locale.matchOS", true);
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// fallback charset list for Unicode conversion (converting from Unicode)
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// currently used for mail send only to handle symbol characters (e.g Euro, trademark, smartquotes)
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// for ISO-8859-1
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