/*** Hide Tab Close buttons ***/
.tabbrowser-tab .tab-close-button {
  visibility: collapse !important;
}


/* == Tree Style Tab == */
/* see: https://github.com/piroor/treestyletab/wiki/Code-snippets-for-custom-style-rules */

/* Hide horizontal tab bar */
#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
  opacity: 0;
  pointer-events: none;
}

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

/* Hide "Tree Style Tab" header at the top of the sidebar */
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
  display: none;
}