userContent.css

* {scrollbar-width: thin; 
    scrollbar-color: #80808060 transparent !important}
 
 
 /*   Newtab   */
 @-moz-document url("about:home"), url("about:newtab") {
   body {
     background-color: #fafafa !important;
     background: radial-gradient(#80808030 1px, transparent 0);
     background-size : 30px 30px}
 
   @media (prefers-color-scheme: dark), (prefers-color-scheme: no-preference) {
     body {background-color: #000 !important}}
 
   .prefs-button {display:none}
 }
 
 
 /*   Addons   */
 button.category:nth-child(1),
 #help-button,
 #helpButton,
 .addon-badge-recommended,
 .addon-description,
 .back-button,
 .header-name,
 .list-section-heading,
 .search-label,
 #sidebar::after,
 .navigation::after
   {display:none !important}
 
 :root {
  --addon-icon-size: 26px !important;
  --card-padding: 14px !important;
  --in-content-box-border-color: #333 !important}
 
 .addon.card {margin-bottom: 5px !important}
 .addon-name {font-weight: 400 !important}
 .addon-name-container {margin-top: 0 !important}
 .main-search {margin: -15px 0 -41px -364px !important}
 .page-options-menu, #updates-message {margin: -22px 0 -10px 0 !important}
 .sticky-container {position: static !important}
 .more-options-button {background-color: transparent !important}
 .more-options-button:hover {background-color: #80808040 !important}
 }