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

@-moz-document domain("yahoo.co.jp") {
  .inner,
  .Toplink.Toplink--inset.Toplink--thumbnail,
  .mdW2aPromo,
  .yads_ydn_frame_image,
  #appbnr.mdSidePromo,
  .posIM,
  .posSMON
  {display: none !important;}
}
  
@-moz-document domain("yimg.jp") {
  .yads_ydn_frame_image
  {display: none !important;}
}