/* Amazon Cloud Player tweak */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document url-prefix("https://www.amazon.co.jp/gp/dmusic/cloudplayer/") {
  .recFooter,                             /* Not interested */
  .recDescription > span[action="buy"],   /* Buy */
  #optionPanel li:nth-last-of-type(-n+2), /* Share */
  .headerActions > .grey,                 /* Delete */
  .ractiveContextMenu > li:nth-child(3)   /* Remove from library */
  {
    display: none !important;
  }

  .listViewDuration {
    font-weight: 300 !important;
    font-size: 1.8rem !important;
  }
}

/* Amazon Cloud Player tweak */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document url-prefix("https://www.amazon.co.jp/gp/dmusic/cloudplayer/") {
  .recFooter,                             /* Not interested */
  .recDescription > span[action="buy"],   /* Buy */
  #optionPanel li:nth-last-of-type(-n+2), /* Share */
  .headerActions > .grey,                 /* Delete */
  .ractiveContextMenu > li:nth-child(3)   /* Remove from library */
  {
    display: none !important;
  }

  #header .listViewDuration {
    font-weight: 300 !important;
    font-size: 1.8rem !important;
  }
}

Fix scope to apply on header control only
Fix scope to apply on header control only
