How to open incognito/private window with Selenium WD for different browser types?

Question

I want to test my test cases in private window or incognito window.

How to do the same in various browsers:

Answer 1

In chrome you can try using -incognito command line switch in options, not sure if there will be a problem with automation extension but worth a try.

ChromeOptions options = new ChromeOptions();
options.addArguments("incognito");

For FireFox, a special flag in the profile can be used for the purpose

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

For IE

setCapability(InternetExplorerDriver.IE_SWITCHES, "-private");