/* Amazon Cloud Player tweak */
@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("music.amazon.co.jp") {
  .recDescription > span[action="buy"],   /* Buy */
  a[href^="#remove/"],                    /* Delete */
  #contextMenu > li:nth-child(2)          /* Remove from library */
  {
    display: none !important;
  }

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

/* Amazon Cloud Player tweak */
@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("music.amazon.co.jp") {
  a[href^="#remove/"],                    /* Delete */
  #contextMenu > li:nth-child(2)          /* Remove from library */
  {
    display: none !important;
  }

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

Remove rule for buy button
Remove rule for buy button

It is not shown on my screen any more.

I recently use Prime music heavily.
Therefore there is a possibility for the algorithm to suggest Prime content only...
