ProtonMail Unread Message Count in Favicon

ProtonMailUnreadMessageCount.js

// ==UserScript==
// @name           ProtonMail Unread Message Count in Favicon
// @description    Shows the number of unread ProtonMail messages in the FavIcon
// @version        1.2
// @author         Tyler Childerhose, Claus Wahlers
// @homepageURL    https://gist.github.com/claus/e92b3b4a3ac6c0ddb4cdb71ad6797fcf
// @match          https://mail.proton.me/*
// @grant none
// ==/UserScript==

//Based off of Eric Bog's "Gmail Unread Message Count in Favicon" https://userscripts-mirror.org/scripts/show/39432
function ProtonMailFavIconUnreadCount() {

  this.removeIcon_ = function() {
    const links = this.head_.getElementsByTagName('link');
    for (let i = 0; i < links.length; i++) {
      if (links[i].rel === 'shortcut icon' || links[i].rel === 'icon') {
        this.head_.removeChild(links[i]);
      }
    }
  };

  this.setIcon_ = function(icon) {
    const newIcon = document.createElement("link");
    newIcon.type = "image/png";
    newIcon.rel = "shortcut icon";
    newIcon.href = icon;
    this.head_.appendChild(newIcon);
  };

  // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20+, 50+, 99+,
  this.icons_ = [
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    'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAKjSURBVDhPpVJtSFNRGH7u2ZzORtNr0oc0Yn3gpqQNTaNArCHNLKlmBiWVIs5MqaxIgoyIQDDB8of+KYqggvlDMSsMkkJJTAVzKz+JKC1W05nh907nnnsNQX8EPfDec+97nuc57/uei/+FcLuEds/O4mVxuXBeyf0TbuTTikANrIKzmlJCgFEPPpA+WE7dF6YUzrLIyKCq+LVoCVmFBLUaIP55ICgYiDDCpI3DcPllukXhLsHZFCqu/o3GsDVI0AQCASxIWxMwPiabrNuA0BgL3PfKaJai+YuivXTrnArtApASoJHF0kpmZoDWZ8CQWzYJDYcqOh4PHlfRGkWLMzaa6SdoFQQYpW9uoIRQmEopZzGYLMCuVEDNNsCO+jqI/uZ6dI17kSFnZCSlAyqVHELNNUqTDwKBWnlT6k0vshdGZ0JMLzPSlaHA/BzwqZe1sCBufFGLzVFBqLxTBs8I4BkGOjq7cKX0NK5eL4Tnx3dFzrzZrUnlG83MQBL39vXgbVsz+l1TEMVwVFSWcuKBw9uRl3MBmfYc7Egy8JyEc8UOsHlAHcAMiOBH43MnDOv5fBg5G1XVNzEw+BGbNppgMBgRZY7FofQs+HyjnONyd/MquImfElh370dR8THEWXairf01zKZYJo7klT1l5l6vB0+cd7EiWMda+YaBgT6czD7KzYQvQ3SaDUTT4+7Cm5YmTurobEXlrYcYG/OiruERtNpgXCzJRnf7Ty7KLUhDrbMB1A9K2C/5WaXGTLR5G/JzL/Ey9ySncWJIiIgTxwtgiozBPtsR6Nn1SCGBrVQME0dAKX01OTnZYbfbPYQQ6nA4RljunRRWq3XUZrN5ExMTx10u1/uF/KKoF9hDOi7P5/NF6PV6P7dfhImJCaLT6ZbkGX4BqPgDy4r+JpaQEugAAAAASUVORK5CYII='
  ];

  this.checkCount_ = function() {
    let matches = document.title.match(/^\((\d+)\)/);
    let count = matches ? parseInt(matches[1], 10) : 0;

    if (this.lastCount_ !== count) {
      let index = count;
      if (count > 98) {
        index = 22; // "99+"
      } else if (count > 49) {
        index = 21; // "50+"
      } else if (count > 19) {
        index = 20; // "20+"
      }

      this.removeIcon_();
      this.setIcon_(this.icons_[index]);
      this.lastCount_ = count;
    }
  };

  const self = this; // Needed to circumvent Greasemonkey problems with "this"-scoping.
  this.lastCount_ = -1;
  this.head_ = top.document.getElementsByTagName("head")[0];

  // Checks every second for a change in the unread count.
  setInterval(function() {
    self.checkCount_();
  }, 1000);

  return true;
}

let initialized = false;
window.addEventListener('load', function() {
  if (!initialized) {
    setTimeout(function() {
      initialized = new ProtonMailFavIconUnreadCount();
    }, 10);
  }
}, true);