index.js

// ==UserScript==
// @name         Stuff You Stuff Comments
// @version      0.1
// @description  A userscript for hiding stuff.co.nz comments
// @author       You
// @namespace  http://www.stuff.co.nz
// @include https://www.stuff.co.nz
// @include http://www.stuff.co.nz/*
// @include https://www.stuff.co.nz/*
// ==/UserScript==

function random_num_from_interval(min,max){
    return Math.floor(Math.random() * (max - min) + min);
}

var new_comments = ["I'm an idiot","I have a stupid opinion","Hurp durp","Probably just a troll","I was raised poorly","Ignorance is bliss","Just another stuff commenter", "Something about PC-gone-mad", "Even my parents can't stand me"];

window.addEventListener('load', function () {
    const commentButton = document.getElementsByClassName('sics-component__gigya-comments-button');
    var old_comments = document.getElementsByClassName("gig-comment-body");
    for (var i=0;i<old_comments.length;i++){
        var comment = (new_comments[random_num_from_interval(0,new_comments.length)]);
        old_comments[i].innerHTML = comment;
    }
})