temp.js

const prev = XMLHttpRequest.prototype.open;

XMLHttpRequest.prototype.open = function(method, url, ...args) {
    if (url === `insert correct url here`) {
        setTimeout(() => {
            prev.apply(this, method, url, ...args);
        }, 5000);
    } else {
        prev.apply(this, method, url, ...args);
    }
};