Navbar Float Height Trigger Zone

@media -moz-pref("ultima.navbar.float"),
       -moz-pref("ultima.navbar.float.fullsize") {
  #main-window:is([sizemode="normal"], [sizemode="maximized"]):not([customizing=""])
  #navigator-toolbox:not(:hover) {
    top: calc(-1 * var(--uc-topbars-combined-height) - 25px) !important;
  }
}