SetupConfig setupConfig = SetupConfig.builder().binPath("C:\\Program Files\\Mozilla Firefox\\firefox.exe")
        .enginePath("D:\\work\\firefox-selenium\\geckodriver.exe")
        .proxyAuthExt("D:\\work\\firefox-selenium\\firefox_proxy_auth.xpi")
        .poolSize(3).build();
ExecutorService executorService = Executors.newFixedThreadPool(3);
ISeleniumPoolService seleniumPool = SeleniumManager.createFirefoxSeleniumPool(setupConfig);

IWebDriverService webDriver = seleniumPool.getWebDriver(3000);
try {
    webDriver.fetch("http://www.badiu.com/", new SeleniumProxy("http", "127.0.0.1", 7598, "user", "pass"));
} finally {
    seleniumPool.release(webDriver);
}

SetupConfig setupConfig = SetupConfig.builder().binPath("C:\\Program Files\\Mozilla Firefox\\firefox.exe")
        .enginePath("D:\\work\\firefox-selenium\\geckodriver.exe")
        .proxyAuthExt("D:\\work\\firefox-selenium\\firefox_proxy_auth.xpi").build();

IWebDriverService webDriver = SeleniumManager.createFirefoxSelenium(setupConfig);
webDriver.fetch("https://www.baidu.com/");