/** BookMark Bar - Reduce Height ********************************************/
  :root[uidensity=compact] #PersonalToolbar toolbarbutton {
      margin-top: 0px; /* Original: 2px */
  }
  :root[uidensity=compact] menupopup > menuitem, menupopup > menu {
    padding-block: 0.25em !important; /* Original: 0.5em */
  }