/************  hide tabs *****************/
/* #TabsToolbar { visibility: collapse !important; }
#main-window[privatebrowsingmode] #TabsToolbar { visibility: visible !important; }
#main-window[privatebrowsingmode] #navigator-toolbox { margin-left: 0px !important; } */









  /*****************  autohide ****************/
  /* #TabsToolbar { visibility: collapse !important; }

#sidebar-header {
  display: none;
}

#sidebar-splitter {
  width: 0 !important;
}

#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
    opacity: 0;
    pointer-events: none;
}
#main-window:not([tabsintitlebar="true"]) #TabsToolbar {
    visibility: collapse !important;
}

#sidebar {
    max-width: none !important;
    min-width: 0px !important;
}

#sidebar-splitter {
    display: none !important;
}

#sidebar-header {
    visibility: collapse;
}


:root {
    --thin-tab-width: 40px;
    --wide-tab-width: 320px;
}

#sidebar-box {
    position: relative !important;
    transition: all 100ms !important;
    min-width: var(--thin-tab-width) !important;
    max-width: var(--thin-tab-width) !important;
}
#sidebar-box:hover {
    transition: all 200ms !important;
    min-width: var(--wide-tab-width) !important;
    max-width: var(--wide-tab-width) !important;
    margin-right: calc((var(--wide-tab-width) - var(--thin-tab-width)) * -1) !important;
    z-index: 1;
} */




/*************************************************************/





/******* hide top title menu *********/
#sidebar-header {
  display: none;
}

/************   tabs layout switch*****************/

#main-window #TabsToolbar {
  height: 43px !important;
  overflow: hidden;
  transition: height .3s .3s !important;
}
#main-window[titlepreface*="XXX"] #TabsToolbar {
  height: 0px !important;
}
#main-window[titlepreface*="XXX"] #tabbrowser-tabs {
  z-index: -40px !important;
}