/**
 * Dynamic Horizontal Tabs Toolbar (with animations)
 * sidebar.verticalTabs: false (with native horizontal tabs)
 */
#main-window #TabsToolbar > .toolbar-items {
  overflow: hidden;
  transition: height 0.3s 0.3s !important;
}
/* Default state: Set initial height to enable animation */
#main-window #TabsToolbar > .toolbar-items { height: 3em !important; }
#main-window[uidensity="touch"] #TabsToolbar > .toolbar-items { height: 3.35em !important; }
#main-window[uidensity="compact"] #TabsToolbar > .toolbar-items { height: 2.7em !important; }
/* Hidden state: Hide native tabs strip */
#main-window[titlepreface*="XXX"] #TabsToolbar > .toolbar-items { height: 0 !important; }
/* Hidden state: Fix z-index of active pinned tabs */
#main-window[titlepreface*="XXX"] #tabbrowser-tabs { z-index: 0 !important; }
/* Hidden state: Hide window buttons in tabs-toolbar */
#main-window[titlepreface*="XXX"] #TabsToolbar .titlebar-spacer,
#main-window[titlepreface*="XXX"] #TabsToolbar .titlebar-buttonbox-container {
  display: none !important;
}
/* [Optional] Uncomment block below to show window buttons in nav-bar (maybe, I didn't test it on non-linux-i3wm env) */
/* #main-window[titlepreface*="XXX"] #nav-bar > .titlebar-buttonbox-container,
#main-window[titlepreface*="XXX"] #nav-bar > .titlebar-buttonbox-container > .titlebar-buttonbox {
  display: flex !important;
} */
/* [Optional] Uncomment one of the line below if you need space near window buttons */
/* #main-window[titlepreface*="XXX"] #nav-bar > .titlebar-spacer[type="pre-tabs"] { display: flex !important; } */
/* #main-window[titlepreface*="XXX"] #nav-bar > .titlebar-spacer[type="post-tabs"] { display: flex !important; } */
#main-window #TabsToolbar {
  transition: max-height 0.3s 0.3s !important;
}

/* Default state: Set initial height to enable animation */
#main-window #TabsToolbar {
  max-height: 3em !important;
}

#main-window[uidensity="touch"] #TabsToolbar {
  max-height: 3.35em !important;
}

#main-window[uidensity="compact"] #TabsToolbar {
  max-height: 2.7em !important;
}

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

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

#main-window[titlepreface*="​"] .titlebar-close {
  display: none;
}

/* Remove sidebar header */
#sidebar-header {
  display: none;
}

/* Prettier, smaller sidebar on linux */
splitter.sidebar-splitter {
  width: 1px !important;
  border: none !important;
  background-color: var(--sidebar-background-color) !important;
}