youtube-next-video.js

function setToggles() {
    document.querySelectorAll('.ytd-watch-next-secondary-results-renderer').forEach(video => {
        if(video.querySelector('paper-toggle-button')) {
            return;
        }
    
        const link = video.querySelector('a');
        if(!link) {
            return;
        }
    
        const href = link.href;
        const toggle = document.querySelector('paper-toggle-button').cloneNode();
        toggle.checked = false;
        toggle.addEventListener('change', () => {
            if(!toggle.checked) {
                window.playNext = undefined;
                return;
            }
    
            document.querySelectorAll('paper-toggle-button').forEach(x => x.checked = false);
            toggle.checked = true;
    
    
            console.log('playing next: ' + href);
            window.playNext = href;
          
        });
        video.appendChild(toggle);
    });
}


const toggleInterval = setInterval(() => {
    if(document.querySelectorAll('.ytd-watch-next-secondary-results-renderer') < 2) {
        return;
    }


    setToggles();
}, 500);

setInterval(() => {
    const currentTime = document.querySelector('.ytp-time-current').innerText;
    const durationTime = document.querySelector('.ytp-time-duration').innerText;

    if(currentTime === durationTime) {
        window.location.href = window.playNext;
    }
}, 500);