Tampermonkey script to automatically pause videos and run it in mpv

runyoutubeinmpv.js

// ==UserScript==
// @name         mpvyoutube
// @namespace    mpvyoutube
// @version      0.1
// @description  Stops video and starts it in mpv. Original code: https://greasyfork.org/de/scripts/370504-youtube-stop-video-autoplay/code
// @author       You
// @match        https://www.youtube.com/*
// @grant        none
// ==/UserScript==

var Debug = false

/**
 * @default
 * @constant
 */
const urlPath = '/watch'


/**
 * Stop YouTube Video Player
 */
let stopPlayback = () => {

    window.open('mpvyoutube://' + window.location.href, '_blank')
    console.debug('stopPlayback')

    // Video Playback Events
    const eventList = ['play', 'playing', 'timeupdate']

    eventList.forEach((eventName) => {
        const videoElement = document.querySelector('video')

        /** @listens video:Event */
        videoElement.addEventListener(eventName, () => {
            console.debug('videoElement', eventName)

            const playerElement = document.querySelector('.html5-video-player')

            // Pause Video
            playerElement.pauseVideo()

            // Status
            console.info('Stopped Playback', 'Media Event:', eventName, 'Player State:', playerElement.getPlayerState())
        }, { once: true })
    })
}


/**
 * Init
 */
let init = () => {
    console.info('init')

    // Check URL
    if (!window.location.pathname.startsWith(urlPath)) { return }

    // Stop Playback
    stopPlayback()
}


/**
 * Handle in-page navigation (classic YouTube)
 * @listens window:Event#spfdone
 */
window.addEventListener('spfdone', () => {
    console.debug('window#spfdone')

    init()
})

/**
 * Handle in-page navigation (modern YouTube)
 * @listens window:Event#yt-navigate-finish
 */
window.addEventListener('yt-navigate-finish', () => {
    console.debug('window#yt-navigate-finish')

    init()
})

/**
 * Handle in-page initial page loading, reloading
 * @listens document:Event#readystatechange
 */
document.addEventListener('readystatechange', () => {
    console.debug('document#readystatechange', document.readyState)

    if (document.readyState === 'interactive') { init() }
})

do you know how to make script that automatically pause a music playing from "music.youtube,com" when a video from "www.youtube.com" is playing, vice versa.