async function scraper() {
    // select a proxy from the pool
    const proxy = proxyPool[Math.floor(Math.random() * proxyPool.length)];

    // set browser options
    const options = new firefox.Options().addArguments('--headless');

    // initialize the webdriver
    const driver = new Builder()
        .forBrowser('firefox')
        // add the proxy to the webdriver
        .setProxy(proxy.manual({
            http: proxy,
            https: proxy,
        }))
        .setFirefoxOptions(options)
        .build();
};