fix bug 14879. reviewed by erik

xpfe/global/resources/content/charsetDetectorsOverlay.js

@@ -58,6 +58,7 @@ function SelectDetectors( event )
    if (pref) {
        debug("get pref 2\n");
        pref.SetCharPref("intl.charset.detector", prefvalue);
+       window.content.location.reload();
    }
   }