Valencia: -moz-background-clip doesn't understand 'border

[myakura]

In https://github.com/jquery/jquery-mobile/blob/master/themes/valencia/jquery.mobile.theme.css#L877

.ui-corner-tl, .ui-corner-tr, .ui-corner-bl, 
.ui-corner-br, .ui-corner-top, .ui-corner-bottom, 
.ui-corner-right, .ui-corner-left, .ui-corner-all,
.ui-btn-corner-tl, .ui-btn-corner-tr, .ui-btn-corner-bl, 
.ui-btn-corner-br, .ui-btn-corner-top, .ui-btn-corner-bottom, 
.ui-btn-corner-right, .ui-btn-corner-left, .ui-btn-corner-all {
  -webkit-background-clip: padding-box;
     -moz-background-clip: padding-box;
          background-clip: padding-box;
}

This -moz-background-clip declaration is ignored since the value padding-box isn't what old Firefox accepts. Firefox1-3.6 only accept either padding, or border for the value. see https://developer.mozilla.org/en/CSS/-moz-background-clip