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

@-moz-document url-prefix("http://www.google.co.jp/reader/"),
url-prefix("http://www.google.com/reader/view/"),
url-prefix("https://www.google.co.jp/reader/view/"),
url-prefix("https://www.google.com/reader/view/") {
  div#chrome {
    z-index: 0 !important;
  }
}