fa-filter/filter.js

"use strict";

chrome.storage.sync.get("blacklist", result => {
    const blacklist = JSON.parse(result.blacklist);
    const gallery = document.querySelector("#gallery-frontpage-submissions");
    const submissions = gallery.querySelectorAll("figure");
    
    submissions.forEach(sub => {
        const title = sub.querySelector("figcaption > p > a").title.toLowerCase();
    
        if (blacklist.some(word => title.indexOf(word) != -1)) {
            gallery.removeChild(sub);
        } else if (sub.style.display == "none") {
            sub.style.display = "";
        }
    });    

    const script = document.createElement("script");
    script.src = chrome.extension.getURL("inject.js");
    (document.head || document.documentElement).appendChild(script);
    script.onload = script.remove;
});