Filter for hckrnews.com (Chrome and Firefox extension)

filter.js

var words = [
'php', 'js', 'javascript', 'css', 'java', 'ruby', 'rust', 'golang', 'go\'s', 'kotlin', 'perl',
'elixir', 'elm ', 'erlang', 'clojure', 'lisp', 'racket', 'scala',
'mozilla', 'firefox', 'mysql', 'mongo', 'latex', 'webgl',
'dell', 'amd',
'google', 'facebook', 'amazon', 'aws ', 'airbnb', 'uber', 'unicorn', 'damore', 'kalanick', 'bezos',
'kubernetes', 'docker', 'tensor', ' ml ', 'machine learning', 'artificial intelligence',
'self-driving', 'tesla', 'musk', 'spacex', 'hyperloop', 'bitcoin', 'btc', 'ethereum', 'blockchain',
'u.s.', 'president', 'trump', 'congress', 'police', 'military', 'federal', 'fbi', 'nsa ', 'snowden',
'francisco', 'new york', 'california', 'bay area', 'texas', 'wall street', 'verizon',
'guardian.com', 'vox.com', 'forbes.com'];

function filter(list) {
    var entries = list.getElementsByClassName('entry row');
    var filteredEntries = [];

    for (var i = entries.length - 1; i >= 0; i--) {
        var link = entries[i].getElementsByClassName('link span15 story')[0];
        if (link == null)
            continue;

        var text = link.innerText.toLowerCase();
        for (var j = words.length - 1; j >= 0; j--) {
            if (text.indexOf(words[j]) != -1) {
                logEntry(entries[i], link);
                filteredEntries.push(entries[i]);
                break;
            }
        }
    }

    for (var i = filteredEntries.length - 1; i >= 0; i--) {
        filteredEntries[i].parentNode.removeChild(filteredEntries[i]);
    }
}

function logEntry(entry, link) {
    var points = entry.getElementsByClassName('points')[0].innerText;
    if (points < 100) {
        return;
    }

    var commentsCount = entry.getElementsByClassName('comments')[0].innerText;
    console.log(commentsCount + '/' + points + ' ' + link.innerText);

    var commentsLink = entry.getElementsByClassName('hn span3 story ')[0].href;
    console.log(commentsLink);
}

var entryLists = document.getElementsByClassName('entries unstyled');
for (var i = entryLists.length - 1; i >= 0; i--) {
    filter(entryLists[i]);
}

var observer = new MutationObserver(function(mutations) {
    mutations.forEach(function(item) {
        item.addedNodes.forEach(function(node) {
            filter(node);
        });
    });
});

var div = document.querySelector('#entries');
observer.observe(div, { childList: true });

manifest.json

{
    "manifest_version": 2,
    "name": "hckrnews.com filter",
    "version": "1.0",

    "description": "Filter out submissions on hckrnews.com based on keywords",

    "permissions": [
        "tabs"
    ],

    "content_scripts": [
        {
            "matches": ["http://hckrnews.com/"],
            "js": ["filter.js"]
        }
    ]
}