(async css => {
	var label = document.createElement("label");
	label.append(AppConstants.MOZ_APP_VERSION_DISPLAY);   
	label.style.cssText = css;
	gURLBar._inputContainer.append(label);
})(`
	padding-block: 1px;
	font-size: 13px;
	color: gray;
`);

(async (attr, rem) => {
	var input = document.getElementById("urlbar-input");
	(rem = () => input.removeAttribute(attr))();
	new MutationObserver(rem).observe(input, {
		attributes: true, attributeFilter: [attr]
	});

	input.setAttribute("placeholder", "Version Info");

})("data-l10n-id");

(async keys => {
	var input = document.getElementById("urlbar-input");
	input.removeAttribute("data-l10n-id");

	input.setAttribute("placeholder", "Version Info");

	var p = Promise.resolve(), noop = () => p;
	for(var key of keys) BrowserSearch[key] = noop;

	Object.getOwnPropertyDescriptor(window, "gURLBar").get
		&& await document.documentReadyForIdle;

	var code = `{${gURLBar.view.input._updateSearchModeUI}}`.replace(
		/this\.document\.l10n\.setAttributes\([^)]+?this\.inputField.+?\);/gs,
		"// placeholder setup was here"
	);
	var url = `data:,Object.assign(gURLBar.view.input, ${encodeURIComponent(code)});`;
	(await ChromeUtils.compileScript(url)).executeInGlobal(window);
})([
	"initPlaceHolder",
	"_setURLBarPlaceholder",
	"_updateURLBarPlaceholder",
	"_updateURLBarPlaceholderFromDefaultEngine"
]);

.....
      if (tipElement.namespaceURI == XUL_NS) {
        lookingForSVGTitle = false;
        titleText = tipElement.getAttribute("tooltiptext");
      } else if (!defView.SVGElement.isInstance(tipElement)) {
        lookingForSVGTitle = false;
        titleText = tipElement.getAttribute("title");
      }

(async (TITLE, TOOLTIP_TEXT) => {

	var win = openDialog("about:blank", "", "chrome,centerscreen,width=340,height=220");
	Services.scriptloader.loadSubScript("chrome://global/content/customElements.js", win);
	await new Promise(resolve => win.addEventListener("DOMContentLoaded", resolve, {once: true}));

	win.windowUtils.loadSheetUsingURIString("data:text/css," + encodeURIComponent(`
		:root, body {
			height: 100vh;
			display: flex;
			align-items: center;
			flex-direction: column;
			justify-content: space-around;
		}
		button {
			color: gray;
			font: 42px monospace, auto;
		}
	`), win.windowUtils.USER_SHEET);

	var doc = win.document;
	doc.title = "Test";


	var htmlButton = doc.createElement("button");
	
	htmlButton.setAttribute("title", `\n   HTML Button ${TITLE} Attribute   \n `);
	htmlButton.setAttribute("tooltiptext", `\n   HTML Button ${TOOLTIP_TEXT} Attribute   \n `);

	htmlButton.append("HTML Button");
	doc.body.append(htmlButton);


	var xulButton = doc.createXULElement("button");

	xulButton.setAttribute("title", `\n   XUL Button ${TITLE} Attribute   \n `);
	xulButton.setAttribute("tooltiptext", `\n   XUL Button ${TOOLTIP_TEXT} Attribute   \n `);

	xulButton.setAttribute("label", "XUL Button");
	doc.body.append(xulButton);
})(
	"\u{1d413}\u{1d408}\u{1d413}\u{1d40b}\u{1d404}",
	"\u{1d413}\u{1d40e}\u{1d40e}\u{1d40b}\u{1d413}\u{1d408}\u{1d40f} \u{1d413}\u{1d404}\u{1d417}\u{1d413}"
);