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Prefer AMP CDN versions of pages (less ads, better adblock)

The AMP versions usually have less ads and are often better to use. You can use "back" to get the regular version - this script will not activate on "back" navigation.

// ==UserScript==
// @name         Prefer AMP CDN versions of pages (less ads, better adblock)
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  The AMP versions usually have less ads and are often better to use. You can use "back" to get the regular version - this script will not activate on "back" navigation.
// @author       Ray Castro
// @match        http://*/*
// @match        https://*/*
// @exclude      https://rdrr.io/*
// @exclude      https://*.reddit.com/*
// @grant        none
// @run-at       document-body
// ==/UserScript==

(function() {
    'use strict';
    // Don't use this if the user used the "back" button, maybe it did not work.
    if (window.performance && window.performance.navigation.type == window.performance.navigation.TYPE_BACK_FORWARD) return;
    // Avoid cycles:
    if (!window.location || window.location.hostname.indexOf("ampproject.org") >= 0) return;
    if (document.referrer && document.referrer.indexOf("amproject.org") >= 0) return;
    // Find an AMP URL:
    var burl;
    var links = document.getElementsByTagName('link');
	for (var i=0; i<links.length; i++) {
        var link = links[i];
        if (link.getAttribute("rel") == "amphtml") {
            burl = link.getAttribute("href");
            break;
        }
    }
    if (!burl) {
        var root = document.documentElement;
        if (root.hasAttribute("amp") ||  root.hasAttribute("\u26A1")) burl = window.location;
    }
    if (!burl) return;
    if (burl.startsWith("https://")) {
        window.location = "https://cdn.ampproject.org/c/s/" + burl.substring(8);
    } else if (burl.startsWith("http://")) {
        window.location = "https://cdn.ampproject.org/c/" + burl.substring(7);
    } else console.log("Neither http nor https?", burl);
})();