/* 
=== managed by silo ===
*/

#main-window #titlebar {
    overflow: hidden;
    transition: height 0.3s 0.3s !important;
}

/* Hidden state: Hide native tabs strip */
#main-window[titlepreface*=" "] #titlebar { height: 0 !important; }

/* Hidden state: Fix z-index of active pinned tabs */
#main-window[titlepreface*=" "] #tabbrowser-tabs { z-index: 0 !important; }