@media not (-moz-bool-pref: "zen.view.sidebar-expanded") { .tabbrowser-tab:is([soundplaying], [muted], [activemedia-blocked])::after { content:''; position: absolute; width: 3px; border-radius: 3px; height: calc(100% - 0px); top: 50%; left: calc(100% - 2px); transform: translateY(-50%); background-color: var(--zen-primary-color); } .tabbrowser-tab:not([selected=true]){ border-radius: 0px; } .tabbrowser-tab:not([selected=true]):hover{ border-radius: 8px; } }