:root[uidensity="compact"] {
  --toolbarbutton-outer-padding: 2px !important; /* Original: 3px, General is 2px */
}

@include Option("userChrome.padding.toolbar_button.compact") {
  :root {
    --toolbarbutton-inner-padding: var(--uc-small-toolbarbutton-inner-padding) !important;
  }
}