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I've made a small updated fork, which is simpler. It adds only the timeline link. And it works today. And I will most likely maintain it (while I use any SEN site):

// ==UserScript==
// @name           StackExchange Timeline Links
// @namespace      stackoverflow
// @description    Add a timeline link to current question in the Stack Exchange Network
// @include        http://meta.stackoverflow.com/*
// @include        http://stackoverflow.com/*
// @include        http://superuser.com/*
// @include        http://serverfault.com/*
// @include        http://*.stackexchange.com/*
// @exclude        */reputation
// ==/UserScript==

(function(){
    var start=function(){
        $(".post-menu").each(function(){
            id = $(this).find("a.short-link")[0].href.replace(/^.*\/a\//, "").replace(/\/\d+(?:#.*)?$/, "").replace(/\D+/, "");
            rlink = $("<span class='lsep'>|</span><a href='/posts/"+id+"/timeline'>timeline</a>");
            $(this).append(rlink);
            return false;
        });
    };

    var script = document.createElement("script");
    script.type = "text/javascript";
    script.textContent = "(" + start + ")();";
    document.body.appendChild(script);
})();