titlebar gone but buttons remain

userChrome.css

#main-window:not([tabsintitlebar="true"]) #TabsToolbar > .toolbar-items {
    visibility: collapse !important;
}

#main-window #titlebar {
  height: 0;
  min-height: 0;
}

#main-window #titlebar .titlebar-spacer {
  visibility: collapse;
}

#main-window #titlebar #TabsToolbar .titlebar-buttonbox-container {
  position: absolute;
  bottom: 10px;
}

/* hide tree style tab header */
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
  display: none;
}