.js in your github

github.js

    var today = new Date();
    var ago = today - 1000 * 60 * 60 * 24 * 1;
    var yesterday = new Date(ago);
    var dd = yesterday.getDate();
    var mm = yesterday.getMonth() + 1;
    var yyyy = yesterday.getFullYear();
    if (dd < 10){ dd = '0' + dd }
    if (mm < 10){ mm = '0' + mm }
    date = yyyy+'-'+mm+'-'+dd;

    [{
        tooltip: 'Your Pull Requests',
        icon: 'git-pull-request',
        url: 'https://github.com/pulls',
        position: 1
    },{
        tooltip: 'Mentioning @mwerner',
        icon: 'mention',
        url: ('https://github.com/pulls?q=is%3Aopen+is%3Apr+mentions%3Amwerner+updated%3A>' + date),
        position: 2,
        notifications: true
    },{
        tooltip: 'Trending Ruby Libraries',
        icon: 'ruby',
        url: 'https://github.com/trending?l=ruby',
        position: 3
    },{
        tooltip: 'Your Conversations',
        icon: 'comment-discussion',
        url: ('https://github.com/pulls?q=is%3Apr+is%3Aopen+commenter%3Amwerner+updated%3A>' + date),
        position: 4,
        notifications: true
    }].forEach(function(i){
      $('<li class="header-nav-item"> \
           <a href="'+i.url+'" class="notification-indicator header-nav-link tooltipped tooltipped-s" aria-label="'+i.tooltip+'"> \
             <span class="octicon octicon-'+i.icon+'"></span> \
           </a> \
         </li>').insertAfter('#user-links .header-nav-item:nth-child('+i.position+')');

      if (i.notifications) {
        $.ajax({ url: i.url }).done(function(data) {
          var html = $.parseHTML(data);
          var items = $('.table-list-item', html);
          if (items.length == 0) { return; }

          var shortcut = $('a[href="' + i.url + '"]');
          shortcut.prepend('<span class="mail-status unread"></span>');
        });
      }
    });