fenix/app/src/main/assets/extensions/ads/ads.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 const ADLINK_CHECK_TIMEOUT_MS = 1000;

function collectLinks(urls) {
    let anchors = document.getElementsByTagName("a");
    for (let anchor of anchors) {
          if (!anchor.href) {
            continue;
          }
          urls.push(anchor.href);
    }
}

function sendLinks() {
    let urls = [];
    collectLinks(urls);

    let message = {
     'url': document.location.href,
     'urls': urls
    };
    browser.runtime.sendNativeMessage("MozacBrowserAds", message);
}

var timeout;

window.onload = function() {
    timeout = setTimeout(sendLinks, ADLINK_CHECK_TIMEOUT_MS);
};

window.onpageshow = function(event) {
    if (event.persisted) {
        timeout = setTimeout(sendLinks, ADLINK_CHECK_TIMEOUT_MS);
    }
};

window.onunload = function() {
  clearTimeout(timeout);
};