Append the question accept rate of a Stack user on their post

questions-accept.user.js

// ==UserScript==
// @name Question Accept Rate
// @version 0.5
// @description Display a user's Stack Exchange question accept rate
// @namespace k0tFZXXD
// @author Michael Hampton
// modified by Balthazar Gronon
// @license GNU GPL v3 or later (http://www.gnu.org/copyleft/gpl.html)
// @include http://stackoverflow.com/*
// @include http://ux.stackexchange.com/*
// @include http://security.stackexchange.com/*
// @include http://softwarerecs.stackexchange.com/*
// @include http://discuss.area51.stackexchange.com/*
// @include http://stackapps.com/*
// @include http://serverfault.com/*
// @include http://superuser.com/*
// @include http://meta.stackoverflow.com/*
// @include http://meta.serverfault.com/*
// @include http://meta.superuser.com/*
// @include http://.stackexchange.com/
// @include http://askubuntu.com/*
// @include http://meta.askubuntu.com/*
// @include http://mathoverflow.net/*
// @include http://meta.mathoverflow.net/*
// @exclude http://chat./
// @require http://courses.ischool.berkeley.edu/i290-4/f09/resources/gm_jq_xhr.js


function with_jquery(f) {
	var script = document.createElement("script");
	script.type = "text/javascript";
	script.textContent = "(" + f.toString() + ")(jQuery)";
	document.body.appendChild(script);
};

with_jquery(function($) {

	function appendRate (rate) {
		if (rate > 80) {
			userclass = "accept-answer-link";
		} else if (rate > 35) {
			userclass = "cool";
		} else if (rate > 20) {
			userclass = "warm";
		} else if (rate > 5) {
			userclass = "hot";
		} else {
			userclass = "supernova";
		}
		percent = (rate >= 0) ? '%' : '';
		accept_rate_text = '<br class="cbt">\n<div class="accept-rate ' + userclass + '">' + rate + percent + ' accept rate</div>\n';
		$(".post-signature.owner > div").append(accept_rate_text);
		$('.user-info').css('height','auto');
	}

	post = location.pathname.match(/questions\/(\d+)\D/i);
	if (!post) return;

	userid = $(".post-signature.owner > div > div.user-details > a")[0].href.match(/\/users\/(\d+)(?:\/|$)/)[1];

	if (userid < 1) return;

	apiurl = location.protocol + "//api.stackexchange.com/2.2/users/" + userid + "?site=" + location.host;
	$.get(apiurl, function(data) {
		var user = data.items[0];
		if (!user) return ;

		return appendRate(user.accept_rate || NaN);
	});
	return ;
});