main.js

var anime_list = document.getElementsByClassName('ranking-list');
var removed = [];

// switches
chrome.storage.sync.get("isOn", function(m) {
  if(m.isOn) {
    chrome.storage.sync.get("filters", function(obj) {
      filter(obj["filters"]);
    });

    chrome.storage.sync.get("renumberIsOn", function(r) {
      if(r.renumberIsOn) {renumber();}
    });

    chrome.storage.sync.get("footerIsOn", function(f) {
      if(f.footerIsOn) {footer();}
    });
  }
});

// Removes elements whose titles match from the set made above
function filter(to_remove) {
    for (var i = anime_list.length - 1; i >= 0; i--) {
        var elementName = anime_list[i].getElementsByClassName('fw-b')[0].innerHTML;
        for (let anime of to_remove) {
            if (elementName.toLowerCase().includes(anime.toLowerCase())) {
                removed.push(elementName);
                anime_list[i].remove();
                break;
            }
        }
    }
}

// Gets starting number to start numbering from
function renumber() {
    var limitLocation = document.URL.search('limit=');
    var beginning = 0;
    if (limitLocation != -1)
        beginning = parseInt(document.URL.substr(limitLocation + 6));

    // Renumbers all anime
    for (var i = 0; i < anime_list.length; i++) {
        var rank = anime_list[i].getElementsByClassName('top-anime-rank-text')[0];
        rank.innerHTML = i + 1 + beginning;
    }
}

// Displays hidden message on bottom
function footer() {
    var nHidden = 50 - anime_list.length;
    if (nHidden > 0) {
        var statement = document.createElement('div');
        statement.innerHTML = 'Hiding ' + nHidden.toString() + ' anime titles: ' +
                              removed.sort().join(', ') + '.';
        document.getElementById('content').appendChild(statement);
    }
}