Wayback Google v0.6 userscript by zanetu

// ==UserScript==
// @name         Wayback Google
// @version      0.6
// @author       zanetu
// @namespace    http://userscripts.org/users/92143
// @description  Adds WayBackMachine (archive.org) links to Google search results and automatically redirects to WayBackMachine when the Google "Cached" link fails (e.g. 404 error).
// @include      /^https?://www\.google\./
// @include      /^https?://webcache\.googleusercontent\./
// @license      GPL version 2 or any later version; http://www.gnu.org/licenses/gpl-2.0.txt
// @require      http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js
// @supportURL  https://github.com/zanetu
// @attribution changes [d:10.06.20][u:<ul><li>added...@supportURL</li></ul>]
// @attribution changes [d:10.04.20][u:<ul><li>Discussion on updating script: https://greasyfork.org/en/discussions/greasyfork/63969</li></ul>]
// @grant        GM_addStyle
// @run-at       document-end
// ==/UserScript==

//google search
if('webcache' != location.hostname.split('.')[0]) {
    //do not run in frames or iframes
    if (window.top == window.self) {
        function modifyGoogle() {
            //add wayback machine archive links
            $('cite').each(function() {
                //legacy, esp. news
                var $firstA = $(this).parent().prev('a')
                if(!$firstA.length) {
                    //legacy, esp. maps
                    $firstA = $(this).prev().children('a:first-child')
                }
                if(!$firstA.length) {
                    $firstA = $(this).closest('.g').find('a:first')
                }
                if($firstA.length && !$firstA.hasClass('wayback')) {
                    $firstA.addClass('wayback')
                    var $container = $(this).parent()
                    var leftMargin = '0px'
                    if('crc' == $container.children(':last').attr('class')) {
                        leftMargin = '16px'
                    }
                    $container
                    .append(' ')
                    .append(
                        $('<a/>')
// Azazello - change 'http' to 'https'
                        .attr('href', 'https://web.archive.org/web/' + $firstA.attr('href'))
                        .html('Wayback').attr('class', 'fl _Zkb wayback')
                        .css({'margin-left':leftMargin, 'display':'inline'})
                    )
                    .append(' ')
                }
            })
        }
        //prevent knowledge graph from disabling wayback links
        GM_addStyle('#center_col {z-index:1;}')
        MutationObserver = window.MutationObserver || window.WebKitMutationObserver
        if(MutationObserver) {
            var observer = new MutationObserver(function(mutations) {
                modifyGoogle()
            })
            //tiny delay needed for firefox
            setTimeout(function() {
                if(1 == $('#main').length) {
                    observer.observe($('#main').get(0), {
                        childList: true,
                        subtree: true
                    })
                }
                modifyGoogle()
            }, 100)
        }
        //for chrome v18-, firefox v14-, internet explorer v11-, opera v15- and safari v6-
        else {
            setInterval(function() {
                modifyGoogle()
            }, 500)
        }
    }
}
//google cache
else {
    //cache miss
    if(1 === $('code:contains("/search?q=cache:")').length) {
        var link = decodeURIComponent(/\=cache\:.*?\:([^\+]+)/.exec(location.search)[1] || '')
// Azazello - change 'http' to 'https'
        link && location.replace('https://web.archive.org/web/' + link)
    }
}