@media (-moz-bool-pref: "zen.tabs.vertical") {
  
  #zen-browser-tabs-container {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow-y: clip;
  }

#vertical-pinned-tabs-container .zen-workspace-tabs-section {
    overflow: auto;
    position: sticky !important;
  }
  
  #tabbrowser-arrowscrollbox {
    min-height: 0 !important;
    max-height: 100% !important;
    position: relative;
  }
  #tabbrowser-arrowscrollbox .zen-workspace-tabs-section {
    position: relative !important;
    overflow-y: auto;
    margin-top: initial !important;
  }
  
  @media (-moz-bool-pref: "mod.fixed-pins.sticky_new_tab") {
    #tabbrowser-arrowscrollbox-periphery {
      position: sticky !important;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--toolbox-bgcolor) !important;
    }
  }
}