So if you visit

http://arm.koji.fedoraproject.org/koji/hosts

And you enter this into your URL bar

javascript:

function custom_pad(n)
{
	if (n < 10)
	{
		return ("0" + n);
	}
	return ("" + n);
}
function custom_chg(k, l)
{
	var x, indxlist = [], rowdlist = [];
	for (x = 0; x < l.length; ++x)
	{
		var t = new Date();
		var s = parseInt(t.getTime() / 1000);
		var r = new Date((s + (4 * 60 * 60) - (30 * 60)) * 1000);
		var q = (r.getFullYear()+""+custom_pad(r.getMonth() + 1)+""+custom_pad(r.getDate())+""+custom_pad(r.getHours())+""+custom_pad(r.getMinutes())+""+custom_pad(r.getSeconds()));
		var c = l[x].getElementsByTagName("td");
		if (c.length < 6)
		{
			continue;
		}
		var d = c[5].innerHTML.replace(/[^0-9]/g, "");
		var u = "green";
		if (parseInt(d) <= parseInt(q))
		{
			u = "red";
		}
		var o = c[1].getElementsByTagName("a");
		for (var y = 0; y < o.length; ++y)
		{
			var n = o[y].innerHTML.replace(/<[^>]+>/g, "");
			o[y].innerHTML = ("<b><font color='" + u + "'>" + n + "</font></b>");
			o[y].href = ("http://arm.koji.fedoraproject.org/koji/" + o[y].href.replace(/^.*\//g, ""));
		}
		if (u == "red")
		{
			indxlist.push(x);
			rowdlist.push(l[x].innerHTML);
		}
	}
	for (x = (indxlist.length - 1); x > -1; --x)
	{
		k.deleteRow(indxlist[x]);
	}
	for (x = (rowdlist.length - 1); x > -1; --x)
	{
		var v = k.insertRow(1);
		v.innerHTML = rowdlist[x];
	}
	var rowdtype = ["row-odd", "row-even"];
	for (x = 1; x < l.length; ++x)
	{
		l[x].className = rowdtype[(x - 1) % 2];
	}
}
if (location.href.match(/^.*(fedoraproject.org|hongkong).*hosts.*/))
{
	var h, i, j;
	h = null;
	while (!h)
	{
		h = document.getElementById("header");
	}
	h.parentNode.removeChild(h);
	h = null;
	while (!h)
	{
		h = document.getElementById("mainNav");
	}
	h.parentNode.removeChild(h);
	h = null;
	while (!h)
	{
		h = document.getElementById("loginInfo");
	}
	h.parentNode.removeChild(h);
	i = null;
	while (!i)
	{
		i = document.getElementsByTagName("h4");
	}
	i[0].parentNode.removeChild(i[0]);
	i = null; j = null;
	while (!i && !j)
	{
		i = document.getElementsByClassName("data-list");
		j = document.getElementsByTagName("tr");
	}
	i[0].deleteRow(0);i[0].deleteRow(0);
	custom_chg(i[0], j);
}

You get a coloured list of downed hosts!