Avengers: Infinity War Spoiler Blocker

Notifies the user if any keywords related to Infinity Wars are detected on the page.
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// ==UserScript==
// @name         Avengers: Infinity War Spoiler Blocker
// @namespace    SawanRC
// @version      0.5
// @description  Notifies the user if any keywords related to Infinity Wars are detected on the page.
// @author       SawanRC
// @include      *
// @grant        GM_setValue
// @grant        GM_deleteValue
// @grant        GM_getValue
// @require      https://code.jquery.com/jquery-3.2.1.min.js
// ==/UserScript==

(function() {
    //Adds a .contains() function for strings.
    String.prototype.contains = function(n){var t=this.toLowerCase().indexOf(n.toLowerCase());return-1===t?!1:!0;};
    var awaitingUser = false;
    var timer;
    var originalTitle;
   var blockedKeywords = ["Avengers", "Infinity War", "Captain America Dies",
                          "Iron Man Dies", "Black Widow", "Hulk", "Thanos",
                          "Avengers Infinity War", "Marvel", "Tony Stark", "Loki", "Thor", "Guardian"];
    var observer = new MutationObserver(function() {
        clearTimeout(timer);
        timer = setTimeout(scanPage, 1000);
	});


    function scanPage() {
        timer = null;
        if (awaitingUser) return;
        if (sessionStorage.getItem("SPOILER-" + window.location.hostname)) {
            console.log("Spoilers unchecked for session.");
            observer.disconnect();
            return;
		}
        if (GM_getValue("SPOILER-" + window.location.hostname)) {
            console.log("Spoilers unchecked for domain.");
            observer.disconnect();
            return;
		}

        $.each(blockedKeywords, function(index, item) {
            if (awaitingUser) return false;

            var html = $('head').text() + $('body').text();

            if (html.contains(item)) {
                awaitingUser = true;
                console.log("Found: " + item);
			}
		});

        if (awaitingUser) {
            hideContent();
		}
	}

    function showContent() {
        hider.hide();
        $("head > title").text(originalTitle);
	}

    function hideContent() {
        $("body").append(hider);

        originalTitle = $("head > title").text();

        $("head > title").text("Spoilers blocked.");

        $("#spoilerBlock-Once").on('click', function() {
            showContent();
		});

        $("#spoilerBlock-Session").on('click', function() {
            sessionStorage.setItem("SPOILER-" + window.location.hostname, true);
            showContent();
		});

        $("#spoilerBlock-Domain").on('click', function() {
            GM_setValue("SPOILER-" + window.location.hostname, true);
            showContent();
		});
	}

    var hider = $("<div>", {id: "spoilerBlockBox", "style": "" });
    var hiderStyle = $(`<style>
	#spoilerBlockBox {
		position: fixed !important;
		text-align: center !important;
		left: 0px !important;
		top: 0px !important;
		width: 100% !important;
		height: 100% !important;
		z-index: 2147483647 !important;
		padding-top: 70px !important;
		background: #111 !important;
		color: #fff !important;
		font-family: Arial !important;
	}
	#spoilerBlockBox h1 {
		color: #fff !important;
		font-size: 30px !important;
		display: inline-block !important;
	}

	#spoilerBlockBox button {
		color: #000 !important;
		background-color: #fff !important;
		padding: 5px !important;
	}</style>`);

    $("head").append(hiderStyle);

    hider.html(`
	<h1>Careful!</h1>
	<p>This page may contain spoilers for Avengers: Infinity War. Are you sure you would like to continue?</p>
	<button id="spoilerBlock-Once">Continue once</button>
	<button id="spoilerBlock-Session">Ignore spoilers for this session</button>
	<button id="spoilerBlock-Domain">Ignore spoilers for this domain</button>
	`);
    scanPage();

    observer.observe(document, {
        childList: true,
        characterData: true,
        subtree: true
	});
})();