Firefox66で多段タブ　メニューバーの件解決しました

// ==UserScript==
// @name           zzzz-MultiRowTab_LiteforFx48.uc.js
// @namespace      http://space.geocities.yahoo.co.jp/gl/alice0775
// @description    多段タブもどき実験版 CSS入れ替えまくりLiteバージョン
// @include        main
// @compatibility  Firefox 66
// @author         Alice0775
// @version        2016/08/05 00:00 Firefox 48
// @version        2016/05/01 00:01 hide favicon if busy
// @version        2016/03/09 00:01 Bug 1222490 - Actually remove panorama for Fx45+
// @version        2016/02/09 00:01 workaround css for lwt
// @version        2016/02/09 00:00
// ==/UserScript==
"user strict";
MultiRowTabLiteforFx();
function MultiRowTabLiteforFx() {
    var css =`
    /* タブバーを下に並べ替え */
    #main-window[lwthemetextcolor="dark"] #window-controls toolbarbutton,
    #main-window[lwthemetextcolor="dark"] .titlebar-buttonbox .titlebar-button {
        color: rgb(24, 25, 26) !important;
    }
    #main-window[lwthemetextcolor="dark"] #window-controls toolbarbutton:not([id="close-button"]):hover,
    #main-window[lwthemetextcolor="dark"] .titlebar-buttonbox .titlebar-button:not([class="titlebar-button titlebar-close"]):hover {
        background-color: var(--lwt-toolbarbutton-hover-background, hsla(0,0%,70%,.4)) !important;
    }
    #titlebar { -moz-box-ordinal-group: 2; -moz-appearance: none !important; }
    #navigator-toolbox:not([style^="margin-top:"])[style=""] #window-controls,.titlebar-buttonbox-container {
        position: fixed;
        top: 0; right:0;
        height: 26px; }  ※←この後に挿入
    [tabsintitlebar="true"][sizemode="normal"] .titlebar-buttonbox-container { top: 1px; }
    [tabsintitlebar="true"][sizemode="maximized"] .titlebar-buttonbox-container { top: 8px; }
    [tabsintitlebar="true"][sizemode="maximized"] #navigator-toolbox { padding-top: 8px !important; }
    [tabsintitlebar="true"]:not([sizemode="fullscreen"]) #nav-bar { padding-right: 139px !important; }
    [sizemode="fullscreen"] #nav-bar { padding-right: 109px !important; }
    /* 多段タブ */

/* navigation toolbar URLバー */
#nav-bar {
    -moz-box-ordinal-group: 1 !important;
    z-index: 10 !important;
    position: relative !important;
    margin-top: 29px !important;
}
/* titlebar メニューバーとタブバーの親 */
#titlebar {
    -moz-box-ordinal-group: 2 !important;
    z-index: 1 !important;
    position: relative !important;
    margin-top: -38px !important;
}
/* menubar メニューバーは、#titlebarの子ども */
#toolbar-menubar {
    position: relative !important;
    margin-top: -30px !important;
}
/* tabs toolbar タブバーは、#titlebarの子ども */
#TabsToolbar {
    position: relative !important;
    margin-top: 47px !important;
}