@-moz-document url-prefix("http://www.pixiv.net/bookmark.php") {
  .column-action-menu {
    width: 782px;
    margin: 0 -1px !important;
    position: fixed;
    bottom: 0;
    border: 1px solid #d6dee5 !important;
    border-top: 0 !important;
    border-bottom: 0 !important;
    box-shadow: 0 -1px 5px -1px rgba(0,0,0,.3);
    z-index: 999 !important;
  }
}