mobile_to_pc.user.js

// ==UserScript==
// @name           mobile to pc
// @namespace      d.hatena.ne.jp/arikui
// @include        http://twitter.com/*
// ==/UserScript==

for each(var a in document.querySelectorAll('.entry-content a')) (function(a){
	if(!a.href.match("http://mobile.twitter.com/statuses/")) return;

	GM_xmlhttpRequest({
		method: "GET",
		url: a.href,

		onload: function(responseDetails){
			if(responseDetails.status == 404){
				a.parentNode.removeChild(a);
				return;
			}

			var match = responseDetails.responseText.match(/href="([^"]+)"\sclass="status_link"/);
			a.href = "http://twitter.com" + match[1];
			a.textContent = a.href;
		}
	});
})(a);