@media not (-moz-bool-pref: "zen.view.sidebar-expanded") {
	.tabbrowser-tab:is([soundplaying], [muted], [activemedia-blocked])::after {
		content:'';
		position: absolute;
		width: 3px !important;
		border-radius: 3px !important;
		height: 100% !important;
		top: 50%;
		left: calc(100% - 2px) !important;
		transform: translateY(-50%);
		background-color: var(--zen-primary-color) !important;
    		transition: height 0.2s ease !important;
	}
	
	.tabbrowser-tab:not([selected=true])::after{
		    height: 50% !important;
	}
	
	.tabbrowser-tab:not([selected=true]):hover::after{
		height: 100% !important;
	}
}