descriptiontube/descriptiontube.css

@-moz-document domain("youtube.com") {
/* DescriptionTube
   Automatically expands YouTube comment boxes.

   Licensed under CC0. See the LICENSE file in this
   repository for more information. */

  .yt-uix-expander-collapsed #watch-description-text {
    max-height:10000px;
    overflow:hidden
  }
}