#tabbrowser-tabs, #tabbrowser-arrowscrollbox {
  min-height: 0 !important;
}

#tabbrowser-tabs tab[first-visible-tab="true"][last-visible-tab="true"],
#tabbrowser-tabs tab[first-visible-tab="true"][last-visible-tab="true"] + toolbarbutton {
  visibility: collapse;
}

#tabbrowser-tabs .tabs-newtab-button {
  visibility: collapse !important;
}

#tabbrowser-tabs tab {
  min-height: var(--tab-min-height);
}

/* Context menu filters */
.menu-iconic-left { opacity: 0.7; }
#contentAreaContextMenu, #placesContext, #tabContextMenu, #toolbar-context-menu #sitebarMenu-popup { opacity: 0.7 !important; }
/* Bookmarks Toolbar folters, Bookmarks and History Menu filters */
#personal-bookmarks .menu-iconic-left, #BMB_bookmarksPopup .menu-iconic-left, #bookmarksMenuPopup .menu-iconic-left, #goPopup .menu-iconic-left { opacity: 0.9 !important; }
menupopup:nth-child(1) { opacity: 0.7; }
/* Page Action context menu filter */
#pageActionContextMenu .menu-iconic-left { opacity: 0.7 !important; }
#pageActionContextMenu  { opacity: 0.7; }
/* Widget Panels (Overflow + add-ons) filter */
.panel-arrowcontent { opacity: 0.7; }