Delayed animation for sidebar and compact "tree style tab" extension tricks

userChrome.css

#TabsToolbar {
        visibility: collapse !important;
}

#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
        display: none;
}
/*
#sidebar-box, #sidebar-box *{ max-width:5em; min-width:50px;}
#sidebar-box:hover, #sidebar-box:hover *{ max-width:none!important;}
*/

:root {
  --sidebar-normal-width: 150px;
  --sidebar-hover-width: 250px;
  --background-color: rgb(0,0,0);
}

#sidebar-box {
  position: relative !important;
  overflow-x: hidden !important;
  min-width: var(--sidebar-normal-width) !important;
  max-width: var(--sidebar-normal-width) !important;
  -moz-transition: all .2s ease-out .2s !important;
}

#sidebar-box:hover {
  margin-left: calc((var(--sidebar-hover-width) - var(--sidebar-normal-width)) * -1) !important;
  min-width: var(--sidebar-hover-width) !important;
  -moz-transition: all .2s ease-out 2s !important;
}
#sidebar-splitter {
    display: none !important;
}