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Reasonable Instagram video player (fix)

Automatically enable video player controls and set default volume to 20%.

// ==UserScript==
// @name         Reasonable Instagram video player (fix)
// @namespace    Violentmonkey scripts
// @version      1.0
// @description  Automatically enable video player controls and set default volume to 20%.
// @author       Zzuk
// @include      *instagram.com*
// @grant        none
// @license MIT
// ==/UserScript==

(function () {
    'use strict';

    function videoFixer() {
        var player = document.querySelector('video:not([fixed])')
        if(!player)
            return
        console.log('updating player');
        player.style.zIndex = 1;
        player.setAttribute('controls', 1);
        player.setAttribute('autoplay', 1);
        player.muted = true;
        player.volume = 0.2;
        player.setAttribute('fixed', 1);
        player.pause();

        var playerSibling = player.nextElementSibling;
        if (playerSibling != null && playerSibling.hasAttribute("data-instancekey")) {
          playerSibling.style.display = 'none';
        }
    }

    setInterval(videoFixer, 100);
})();