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);
})();