Google Analytics opt-out

Defines the Google Analytics opt-out object on every page.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        Google Analytics opt-out
// @namespace   zdnq5fclhrdh8lgo
// @match       *://*/*
// @grant       none
// @version     1.2
// @license     MIT
// @description Defines the Google Analytics opt-out object on every page.
// @run-at      document-start
// @inject-into content
// ==/UserScript==

(function () {
	"use strict";

	const defineOptout = (null, function (unwrapper = (x)=>x, exporter = (f)=>f) {
		const _gaUserPrefs = new window.Object();
		const ioo = exporter(function ioo() { return true; });


		// Define property directly if this is an Xray
		Reflect.defineProperty(unwrapper(_gaUserPrefs), "ioo", {
			enumerable: true,
			configurable: false,
			get: exporter(() => ioo),
			set: exporter(() => {})
		});

		Reflect.defineProperty(unwrapper(window), "_gaUserPrefs", {
			enumerable: false,
			configurable: false,
			get: exporter(() => _gaUserPrefs),
			set: exporter(() => {})
		});
	});


	if ("wrappedJSObject" in window) {
		// Bypass Firefox sandbox
		defineOptout(XPCNativeWrapper.unwrap, (f) => exportFunction(f, window));
	} else {
		// Inject script tag (Chrome)
		const script = document.createElement("script");
		script.text = `"use strict";(${defineOptout})();`;
		(document.head ?? document.documentElement).prepend(script);
		script.remove();
	}
})();