In Firefox 13, main menu items are displayed without shadows and rounded corners, because “moz” prefix is no longer supported by Firefox.

!http://img826.imageshack.us/img826/4595/image000mm.png

navigation.css:

#navbar .sub-menu li:hover, .hover_ie {

   background: #ccd1d4 no-repeat;

   -moz-border-radius: 5px;

   -webkit-border-radius: 5px;

   -moz-box-shadow: 0 0px 2px rgba(0,0,0,0.3);

   -webkit-box-shadow: 0 0px 4px rgba(0,0,0,0.3);

   border:  1px solid #DDD;

   padding: 5px 5px 7px 5px;

}

The same is in Opera 10/11 and IE9. They support only standard border-radius and box-shadow properties without any prefixes. Modern versions of Chrome/Safari also don’t need the webkit prefix.

These prefixes are also used in website.css.