function sleep(ms) { 
    return new Promise(resolve => setTimeout(resolve, ms)); 
    } 
    async function deleteLikedVideos() { 
    'use strict'; 
    var items = document.querySelectorAll('ytd-menu-renderer > yt-icon-button.dropdown-trigger > button[aria-label]'); 
    var out; 
    for (var i = 0; i < items.length; i++) { 
    items[i].click(); 
    out = setTimeout(function () { 
    if (document.querySelector('tp-yt-paper-listbox.style-scope.ytd-menu-popup-renderer').lastElementChild) { 
    document.querySelector('tp-yt-paper-listbox.style-scope.ytd-menu-popup-renderer').lastElementChild.click(); 
    } 
    }, 100); 
    await sleep(500); // sleep cause browser can not handle the process 
    clearTimeout(out); 
    } 
    } 
    deleteLikedVideos();