Mass delete Youtube Watch Later videos

yt-watch-later-delete.js

// Go to https://www.youtube.com/playlist?list=WL and run this in browser console.
var popupContainer = $("ytd-popup-container");
var videos = $("ytd-playlist-video-list-renderer #contents").getElementsByClassName("ytd-playlist-video-list-renderer")
function removeVideo() {
    if (videos.length) {
        videos[0].getElementsByTagName("button")[0].click();
        setTimeout(function() {
            var dropdown = popupContainer.getElementsByTagName("tp-yt-iron-dropdown");
            console.log(dropdown);
            var stringElems = dropdown[0].getElementsByClassName("yt-formatted-string");
            console.log(stringElems);
            if (stringElems[0].innerText.trim() == "Remove from") {
                stringElems[0].click();
            }
            setTimeout(removeVideo, 500);
        }, 100);
    }
}
setTimeout(removeVideo, 0);