:root[zen-compact-mode="true"]:not([customizing]):not([inDOMFullscreen="true"]) {
  @media (-moz-bool-pref: "zen.view.compact.hide-tabbar") or (-moz-bool-pref: "zen.view.use-single-toolbar") {
    &:not([zen-right-side="true"]) #navigator-toolbox[flash-popup] {
      left: calc(-1 * var(--zen-sidebar-width) + var(--zen-element-separation)) !important;
    }
    
    &[zen-right-side="true"] #navigator-toolbox[flash-popup] {
      right: calc(-1 * var(--zen-sidebar-width) + var(--zen-element-separation)) !important;
    }
  }
}