@-moz-document url(chrome://mozapps/content/extensions/extensions.xul) {
  #getMore {
    display: none !important;
  }

  #extensionsView richlistitem[selected=true] {
    background-image: none !important;
  }

  #extensionsView richlistitem:not([selected=true]) .addonIcon {
    height: 16px !important;
    width: 16px !important;
  }

  #extensionsView richlistitem:not([selected=true]) .addon-description {
    display: none !important;
  }
}