Authors of comments in issue: sort and remove duplicates

countAuthors.js

// get all elements with authors
var $authors = document.querySelectorAll('.comment .author');
var authors = [];
$authors.forEach(item => authors.push(item.innerText));
// sorting
authors.sort();
// remove duplicates
[...new Set(authors)];

// bookmarklet
var a=[];$$('.comment .author').map(i=>a.push(i.innerText));a.sort();[...new Set(a)];

// get all elements with authors
var $authors = document.querySelectorAll('.comment .author');
var authors = [];
$authors.forEach(item => {
    var text = item.innerText;

    if(!authors[text]) {
        authors.push(text);
    }
});
// sorting
authors.sort();

// bookmarklet
var a=[];$$('.comment .author').map(i=>{var t=i.innerText;if(!a[t])a.push(t)});a.sort();