Hi Kevin,
you can open two WebDrivers manually and switch between them. Drivers are located in Katalon installation folder - configuration\resources\drivers
System.setProperty("webdriver.chrome.driver","C:\\path\\to\\chromedriver.exe")
System.setProperty("webdriver.gecko.driver", "C:\\path\\to\\geckodriver.exe")
WebDriver chrome = new ChromeDriver()
WebDriver ff = new FirefoxDriver()
// let Katalon know that chrome driver is usedDriverFactory.changeWebDriver(chrome)// Katalon keywords work as usual
WebUI.navigateToUrl("www.chrome.com")// now you can switch to FF driver
DriverFactory.changeWebDriver(ff)
WebUI.navigateToUrl("www.firefox.com")