How to use

setProxy

method

in

org.openqa.selenium.firefox.FirefoxOptions

@Override
protected FirefoxOptions getDefaultOptions(Proxy proxy) {
 FirefoxOptions options = new FirefoxOptions();
 if (proxy != null) {
  options.setProxy(proxy);
 }
 return options;
}

/**
 * Create and initialize FirefoxOptions.
 *
 * @param driverOptions driver options.
 * @return FirefoxOptions.
 */
public static FirefoxOptions newFirefoxOptions(DriverOptions driverOptions) {
  FirefoxOptions options = new FirefoxOptions();
  if (driverOptions.has(HEADLESS))
    options.setHeadless(driverOptions.getBoolean(HEADLESS));
  Proxy proxy = newProxy(driverOptions);
  if (proxy != null)
    options.setProxy(proxy);
  return options;
}