--- mozilla-release/modules/libpref/init/all.js.orig	2015-07-03 23:53:37.346065372 +0200
+++ mozilla-release/modules/libpref/init/all.js	2015-07-03 23:56:39.783125671 +0200
@@ -198,7 +198,7 @@
 // 1 = always
 // 2 = never
 pref("browser.display.document_color_use", 0);
-pref("browser.display.use_system_colors",   false);
+pref("browser.display.use_system_colors",   true);
 pref("browser.display.foreground_color",    "#000000");
 pref("browser.display.background_color",    "#FFFFFF");
 pref("browser.display.force_inline_alttext", false); // true = force ALT text for missing images to be layed out inline
@@ -1741,7 +1741,7 @@
 pref("intl.charset.fallback.override",      "");
 pref("intl.charset.fallback.tld",           true);
 pref("intl.ellipsis",                       "chrome://global-platform/locale/intl.properties");
-pref("intl.locale.matchOS",                 false);
+pref("intl.locale.matchOS",                 true);
 // fallback charset list for Unicode conversion (converting from Unicode)
 // currently used for mail send only to handle symbol characters (e.g Euro, trademark, smartquotes)
 // for ISO-8859-1