https://emilianosampaio.com/favicon-landing.js

1image_counter = 0; // To keep track of the current image
2setInterval(function () {
3    if (document.querySelector("link[rel='icon']") !== null)
4        document.querySelector("link[rel='icon']").remove();
5    if (document.querySelector("link[rel='shortcut icon']") !== null)
6        document.querySelector("link[rel='shortcut icon']").remove();
7
8    // add new favicon image
9    document.querySelector("head").insertAdjacentHTML('beforeend', '<link rel="icon" href="/favicons/ezgif-frame-0' + image_counter + '.jpg" type="image/png">');
10
11
12    if (image_counter === 76)
13        image_counter = 0;
14    else
15        image_counter++;
16}, 100);