(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}"
);

// Mod
location == "chrome://browser/content/browser.xhtml" && (async img => {

	var menuitem = menu_pageInfo.cloneNode(false);
	menuitem.id = "context-viewPageInfo-mod";
	document.getElementById("context-viewsource").before(menuitem);

	var hidden = (d = nsContextMenu.contentData, {context: c, browser: b} = d) =>
		c.link || d.selectionInfo.text || c.onImage || c.onCanvas || c.onVideo || c.onAudio || c.onTextInput || b.className.startsWith("webext");

	menuitem.render = () => {
		if (menuitem.hidden = hidden()) return;

		menuitem.removeAttribute("key");
		menuitem.className = "menuitem-iconic";

		delete menuitem.render;
		menuitem.render();
		menuitem.querySelector(".menu-iconic-icon").src = img;

		// Just visual diff, not part of mod.
		menuitem.querySelector(".menu-iconic-icon").style.filter = "hue-rotate(-100deg) brightness(1.35)";

		menuitem.render = () => menuitem.hidden = hidden();
	}
})(
	"data:image/png;base64,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"
);