How to open Chrome/Firefox/Internet Explorer/Opera in private/incognito window in Selenium WebDriver

• Chrome:

  DesiredCapabilities capabilities = DesiredCapabilities.chrome();
  ChromeOptions options = new ChromeOptions();
  options.addArguments("incognito");
  capabilities.setCapability(ChromeOptions.CAPABILITY, options);

• FireFox:

  FirefoxProfile firefoxProfile = new FirefoxProfile();    
  firefoxProfile.setPreference("browser.privatebrowsing.autostart", true);

• Internet Explorer:

  DesiredCapabilities capabilities = DesiredCapabilities.internetExplorer();
  capabilities.setCapability(InternetExplorerDriver.FORCE_CREATE_PROCESS, true); 
  capabilities.setCapability(InternetExplorerDriver.IE_SWITCHES, "-private");

• Opera:

  DesiredCapabilities capabilities = DesiredCapabilities.operaBlink();
  OperaOptions options = new OperaOptions();
  options.addArguments("private");
  capabilities.setCapability(OperaOptions.CAPABILITY, options);

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