bookmarkAutoHide.css

#PersonalToolbar:not([customizing]) {
    position: fixed !important;
    margin-top: -44px !important;
    padding-bottom: 5px !important;
    height: 40px !important;
    width: 100% !important;
    border: none !important;
    transform: scaleY(0.8);
    transform-origin: center bottom;
    transition: transform cubic-bezier(.22,.61,.36,1) 0.15s !important;
    z-index: 2;
}
  
#PersonalToolbar:not([customizing]) #personal-bookmarks {
    opacity: 0;
    transition: opacity 0.15s;
}
  
#titlebar {
    z-index: 4 !important;
}
  
#nav-bar {
    z-index: 3 !important;
}
  
/* bring up nav-bar z-index when megabar is open */
#nav-bar[urlbar-exceeds-toolbar-bounds="true"] {
    z-index: 5 !important;
}
  
.tabbrowser-tab[selected="true"] {
    z-index: 4 !important;
}
  
#navigator-toolbox:hover > #PersonalToolbar:not([customizing]) {
    position: fixed !important;
    transform: translateY(100%) scaleY(1);
}
  
#navigator-toolbox:hover > #PersonalToolbar:not([customizing]) #personal-bookmarks {
    opacity: 1;
}
  
/* compact theme */
:root[lwtheme="true"] #PersonalToolbar:not([customizing]) {
    top: var(--toolbar-offset-height) !important;
}
  
/* compact + titlebar active */
:root[lwtheme="true"]:not([tabsintitlebar="true"])
#nav-bar ~ #PersonalToolbar:not([customizing]) {
    top: var(--toolbar-offset-height) !important;
}
  
/* default theme */
:root:not([lwtheme="true"]) #PersonalToolbar:not([customizing]) {
    top: var(--toolbar-offset-height) !important;
}
  
/* default + titlebar active */
:root:not([lwtheme="true"]):not([tabsintitlebar="true"])
#nav-bar ~ #PersonalToolbar:not([customizing]) {
    top: var(--toolbar-offset-height) !important;
}

#tabbrowser-tabs {
    margin-left: 6px !important;
}