b.hatena.ne.jp/video + niconico customize

hatena_nico.js

// ==UserScript==
// @name           test
// @namespace      http://d.hatena.ne.jp/karronoli
// @description    add nicovideo info to b.hatena.ne.jp/video 
// @include        http://b.hatena.ne.jp/video
// @version        1.0
// ==/UserScript==

(function () {
    "use strict";
    let nico_link = document.evaluate(
        '//a[contains(@href, "nicovideo.jp/")][@class="entry-link"]',
        document, null, 7, null);
    for (let i = 0; i < nico_link.snapshotLength; ++i) (function (nl) {
        let [target] = nl.pathname.match(/[^\/]+$/);
        GM_xmlhttpRequest({
            method: 'GET',
            url: 'http://ext.nicovideo.jp/api/getthumbinfo/' + target,
            data: '',
            onload: function(res) {
                let rt = res.responseText;
                let test = rt.match(/<(video_id)>(.+)<\/\1>/);
                if (!test || test[2] != target) return ;
                let info = [
                    {view_counter: rt.match(/<(view_counter)>(.+)<\/\1>/)[2]},
                    {comment_num: rt.match(/<(comment_num)>(.+)<\/\1>/)[2]},
                    {length: rt.match(/<(length)>(.+)<\/\1>/)[2]}
                ];
                let ul = document.createElement('ul'),
                    k0 = function (o) {return Object.keys(o)[0]};
                ul.innerHTML = info.reduce(function(p, c) {
                    return p + '<li>' + k0(c) + ' : ' + c[k0(c)] + '</li>';
                }, '');
                nl.parentNode.appendChild(ul);
            }
        });
    })(nico_link.snapshotItem(i))

})();

work on Firefox 11.0 & Greasemonkey 0.9.18 by version 1.0