:root {
  /* Adjust the tab height to your liking */
  --tab-min-height: 30px !important;
  --arrowpanel-menuitem-padding: 4px 8px !important;
}

#tabbrowser-tabs {
  --user-tab-rounding: 2px;
}

.tab-background {
  border-radius: var(--user-tab-rounding) var(--user-tab-rounding) 0px 0px !important;
  margin-block: 1px 0 !important;
}

menupopup > menuitem, menupopup > menu {
  padding-block: 4px !important;
}