TreeStyleTab userChrome.css

/*
 * <profile_dir>/chrome/userChrome.css
 * hides the horizontal tabs toolbar
 * and removes the sidebar header
*/

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

#TabsToolbar {
    visibility: collapse !important;
}

#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
    display: none;
}

#sidebar {
    min-width: 100px !important;
}