hn-blacklist.js

const banned = [
    /^medium\.com$/,
    /^bloomberg\.com$/,
    /^wired\.com$/,
    /^bbc\.com$/,
    /^bbc\.co\.uk/,
    /^slate\.com$/,
    /^techcrunch\.com$/,
    /^lifehacker\.com$/,
    /^washingtonpost\.com$/,
    /^nytimes\.com$/,
    /^theregister\.co\.uk$/,
    /^vice\.com$/,
    /^wsj\.com$/,
    /^forbes\.com$/,
    /^independent\.co\.uk$/,
    /^thehill\.com$/,
    /^npr\.org$/,
    /^engadget\.com$/,
    /^businessinsider\.com$/,
    /^9to5mac\.com$/,
    /^theguardian\.com$/,
    /^theverge\.com$/,
    /^economist\.com$/,
    /^gizmodo\.com$/,
    /^qz\.com$/,
    /^theatlantic\.com$/,
    /^buzzfeed\.com$/,
    /^twitter\.com$/,
    /^wired\.co\.uk$/,
    /^aeon\.co$/,
    /^nautil\.us$/,
    /^atlasobscura\.com$/,
    /^vox\.com$/,
    /^nymag\.com$/,
    /^mashable\.com$/,
    /^newyorker\.com$/,
    /^hackernoon\.com$/,
    /^cnbc\.com$/,
    /^buzzfeednews\.com$/,
];

const rows = Array.from(document.querySelectorAll('#hnmain .itemlist tr'));

rows.forEach((row, i) => {
    if (row.className !== 'athing') return;
    const site = row.querySelector('.sitestr');
    if (site && banned.find(b => b.test(site.innerText))) {
        console.log(`removing ${site.innerText}`);
        row.remove();
        rows[i + 1].remove();
        rows[i + 2].remove();
    }
});