@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("search.yahoo.co.jp") {
  body {
    counter-reset: result !important;
  }

  div.hd h3:before {
    content: counter(result) ". " !important;
    counter-increment: result !important;
    color: #000 !important;
    font-size: 120% !important;
  }
}

@-moz-document domain("search.yahoo.com") {
  body {
    counter-reset: result !important;
  }

  div.res h3:before {
    content: counter(result) ". " !important;
    counter-increment: result !important;
    font-size: 110% !important;
  }
}