Correct the padding in firefox (necolas#671)

Author: 4refael

normalize.css

@@ -292,6 +292,14 @@ button:-moz-focusring,
   outline: 1px dotted ButtonText;
 }
 
+/**
+ * Correct the padding in Firefox.
+ */
+
+fieldset {
+  padding: 0.35em 0.75em 0.625em;
+}
+
 /**
  * 1. Correct the text wrapping in Edge and IE.
  * 2. Correct the color inheritance from `fieldset` elements in IE.