Toggle Sprites on Scene page in place of the cover

StashToggleSprite.user.js

// ==UserScript==
// @name         Stash Toggle Sprite
// @namespace    Stash
// @version      0.2
// @description  Toggle Sprites on Scene page in place of the cover
// @author       iix63500 & Flashy
// @match        http://localhost:9999/scenes/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function creareSpriteToggle() {
        const poster = document.querySelector('.vjs-poster')
        if (!poster) {
            return
        }
        const scrubberItem = document.querySelector('.scrubber-item')
        if (!scrubberItem) {
          return
        }

        if (poster.querySelector('button')) {
            return
        }

        const toggleBtn = document.createElement('button')
        toggleBtn.type = 'button'
        toggleBtn.innerHTML = 'TOGGLE SPRITE'
        toggleBtn.style.padding = '1em'

        const posterUrl = poster.style.backgroundImage
        const spriteUrl = scrubberItem.style.backgroundImage

        let toggle = false
        toggleBtn.addEventListener('click', (e) => {
            e.preventDefault()
            e.stopPropagation()
            if (toggle) {
                poster.style.backgroundImage = posterUrl
            } else {
                poster.style.backgroundImage = spriteUrl
            }
            toggle = !toggle
        })
        poster.appendChild(toggleBtn)
    }

    window.setInterval(creareSpriteToggle, 300)
})();