userChrome.css

#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
  opacity: 0;
  pointer-events: none;
}
#main-window:not([tabsintitlebar="true"]) #TabsToolbar {
    visibility: collapse !important;
}
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
  display: none;
}
#sidebar {
  min-width: 100px !important;
}
.contextual-identity-marker {
  position: absolute !important;
  pointer-events: none;Full Auto-show/hide Theme
  z-index: 0;
  
  bottom: 0 !important;
  left: 0 !important;
  right: 0 !important;
  top: 0 !important;
  
  width: unset !important;
  height: unset !important;  
    
  opacity: 0.5;
}