Firefox userChrome.js greasemonkeyスクリプトｽﾚ45

■前スレ
Firefox userChrome.js greasemonkeyスクリプトｽﾚ43
https://egg.5ch.net/test/read.cgi/software/1700794897/
Firefox userChrome.js greasemonkeyスクリプトｽﾚ44
https://egg.5ch.net/test/read.cgi/software/1710342779/

良ければ修正箇所を教えて下さい。自分にとっては無いとすごく不便です
// ==UserScript==
// @name searchbutton.uc.js
// @include main
// @charset utf-8
// ==/UserScript==
var ucjs_searchButton = {
buttonName: [
"検索エンジン1",
"検索エンジン2",

],
init: function() {
var searchbar = document.getElementById("searchbar");
if (!searchbar) return;

Services.search.init().then(async (rv) => {
if (Components.isSuccessCode(rv)) {
for (let name of this.buttonName) {
var engine = Services.search.getEngineByName(name);
if(!engine) break;

var button = document.createXULElement("toolbarbutton");
button.engine = engine;
button.setAttribute("image", await engine.getIconURL());
button.setAttribute("label", engine.name);
button.setAttribute("tooltiptext", engine.name);
button.setAttribute("class", "toolbarbutton-1 chromeclass-toolbar-additional");
button.setAttribute("oncommand", "ucjs_searchButton.search(event)");
button.setAttribute("onclick", "checkForMiddleClick(this, event)");
searchbar.parentNode.insertBefore(button, searchbar.nextSibling);
}
}
})
},
search: function(event) {
var searchbar = document.getElementById("searchbar");
var qStr = searchbar.hasAttribute("empty") ? "" : searchbar.value;
var engine = event.target.engine;
const where = gBrowser.selectedTab.isEmpty? "current" : "tab";
searchbar.doSearch(qStr, where, engine, {}, false);
},
};
ucjs_searchButton.init();

>>369
oncommandとonclickの行を
button.addEventListener("command", event => ucjs_searchButton.search(event));
button.addEventListener("click", event => checkForMiddleClick(button, event));
かな