resource-domains.bookmarklet.js

javascript:
alert((function(list) {
	console.log(list);
	var arr = [];
	for (var host in list) arr.push(host + ': ' + list[host]);
	arr.sort(function(a, b) { return parseInt(b.split(': ')[1]) - parseInt(a.split(': ')[1]); });
	return arr;
})(performance.getEntriesByType('resource').reduce(function(list, res) {
	var host = res.name.match(/\/\/([^/]+)/)[1];
	list[host] ? (list[host]++) : (list[host] = 1);
	return list;
}, {})).join("\n"));
void(0);