Replace lost button and input focus style

Fix #481

normalize.css

@@ -314,6 +314,15 @@ input::-moz-focus-inner {
   padding: 0;
 }
 
+/**
+ * Replace focus style removed in the border reset above
+ */
+
+button:-moz-focusring,
+input:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
 /**
  * Address Firefox 4+ setting `line-height` on `input` using `!important` in
  * the UA stylesheet.