userContent.css

@-moz-document url("about:newtab") {
  body {
    background-color: #141415 !important;
  }
  .top-sites {
    background-color: #212121;
    border-radius: 1rem;
  }
  span{
    color:#989898;
  }
  .top-site-outer .top-site-icon{
    background-color: transparent !important;
  }
  .card-outer > a{
    color:#717C8A !important;
  }
  .card-outer{
    background: #151A21 !important;
  }
  .icon.icon-bookmark-added{
    background-image: url("https://cdn2.iconfinder.com/data/icons/competition-success/512/star_bookmark_favorite_shape_competitive_trophy_medal_winning_popularity_glory_high_awards_winners_badge_hero_victory_hit_proud_honor_leadership_competition_prize_premium_-512.png") !important;
  }
  .collapsible-section{
    background-color:#212121;
    border-radius: 1rem;
  }
.top-site-outer .tile{
  color:transparent !important;
}
.card-outer:-moz-any(:hover, :focus, .active):not(.placeholder) .card-title{
  color:#008FE5 !important;
}
}