Tampermonkey script for Spotify delay play for Quest 2 VR

spotify_delay_play.js

// ==UserScript==
// @name         Spotify delay play for Quest 2 VR
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Hits the play button after a delay so you can listen to spotify on Oculus Quest 2. You can sideload firefox android app with sidequest, add the tampermonkey add-on, add this script, and open spotify in desktop mode in firefox, move it to a sidepanel, start playing what you want, pause it, hit "Play in 15s", open your VR game of choice.
// @author       Nick Vissari
// @match        *://open.spotify.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=spotify.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    setInterval(() => {
        //document.evaluate("//button[contains(@aria-label, 'Play')]", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue
        const play_button = document.querySelectorAll('[data-testid="control-button-playpause"]')[0]
        if(!play_button) return

        let delay_button = document.getElementById('delay_play')
        if(!delay_button){
            // add delay play button
            let indicator = document.createElement('span')
            indicator.innerHTML = '👍'
            indicator.hidden = true
            delay_button = document.createElement('span')
            delay_button.setAttribute('id', 'delay_play')
            delay_button.innerHTML = 'Play in 15s'
            delay_button.onclick = () => {
                delay_button.hidden = true
                indicator.hidden = false
                setTimeout(() => {
                    play_button.click()
                    delay_button.hidden = false
                    indicator.hidden = true
                }, 15000)
            }
            play_button.after(delay_button)
            play_button.after(indicator)
        }
    }, 1000)
})();

Turns out firefox closes immediately when you open another app. But the built in quest browser remains open. I deployed jellyfin, added some songs, and added the above code (almost verbatim) to main.jellyfin.bundle.js.

This is the only change required:

const play_button = document.querySelectorAll('.playPauseButton')[0]