Пусть интернет прогнётся под нас

if(!document.querySelector('a[data-cid]'))
{
   document.querySelectorAll('.comments_list ul > li.comment_item').forEach(li => {
		if(li.querySelector('ul > li')) {
			var liNext = li.nextElementSibling;
			li.parentNode.querySelectorAll('#' + li.id + ' > .comment_body .comment-item__controls').forEach(dv => {
				var a = document.createElement('a');
				a.innerText = 'hide responses';
				a.setAttribute('href', '#');
				a.setAttribute('data-cid', li.id);
				dv.appendChild(a);

				if(liNext) {
					var a = document.createElement('a');
					a.style.marginLeft = '1em';
					a.innerText = 'next in the level';
					a.setAttribute('href', '#' + liNext.id);					
					dv.appendChild(a);
				}
			}); 
		}
        });

        var rates = [];
        document.querySelectorAll('.comments_list ul > li.comment_item').forEach(li => {
		var rate = parseInt(li.parentNode.querySelector('#' + li.id + ' > .comment_body .js-voting span').innerText.replace('–', '-'));
		rates.push({ r: rate, id: parseInt(li.id.substring(8)) });
        });

        rates.sort(function(a, b) {
            if(a.r < b.r)
                return 1;
            else if(a.r > b.r)
                return -1;
            else {
                if(a.id < b.id)
                    return -1;
                else if(a.id > b.id)
                    return 1;
                else
                    return 0;
            }
        });

	var currentRate = 0;
	var a = document.createElement('a');					
	a.innerText = '++';
	a.setAttribute('style', 'margin-top: 2em; font-weight: bold; font-size: 20px; color: #808020; background-color: white; text-decoration: none; cursor: pointer;');
        document.querySelector('#xpanel').appendChild(a);
	a.addEventListener('click', (event) => {
		if(currentRate < rates.length)
		{
			var url = location.href;
			location.href = "#comment_" + rates[currentRate].id;
			history.replaceState(null,null,url);
			currentRate++;
		}
	});

   document.querySelector('.comments_list').addEventListener('click', (event) => {
	var t = event.target;
	if(!t.getAttribute('data-cid'))
		return;

	event.preventDefault();
        event.stopPropagation();
	t.innerText = (t.innerText == 'hide responses' ? 'show responses' : 'hide responses');
        document.querySelectorAll('li#' + t.getAttribute('data-cid') + ' > ul').forEach(ul => { 
		ul.style.display = (ul.style.display == 'none' ? 'block' : 'none'); 
	});	
   });
}