--- a/mobile/chrome/content/content.css
+++ b/mobile/chrome/content/content.css
@@ -46,17 +46,17 @@ html *:not(embed):focus, *:focus > font 
 }
 
 html *|*:link:focus, *|*:visited:focus {
   outline-offset: -2px;
 }
 
 html button::-moz-focus-inner, input[type="reset"]::-moz-focus-inner, input[type="button"]::-moz-focus-inner, input[type="submit"]::-moz-focus-inner {
   padding: 1px 2px 1px 2px;
-  border: 0px !important;
+  border: 1px none transparent !important;
 } 
 
 html button:focus::-moz-focus-inner, input[type="reset"]:focus::-moz-focus-inner, input[type="button"]:focus::-moz-focus-inner, input[type="submit"]:focus::-moz-focus-inner {
   border-color: ButtonText !important;
 }
 
 /* Style the scrollbars */
 scrollbar {