How might I simulate a private browsing experience in Watir? (Selenium)

Question

Watir is a Selenium-based black-box testing tool that can automate tasks on the browser.

I would like to be able to open up a Watir::Browser.new that is in private b

Answer 1

For Chrome

browser = Watir::Browser.new :chrome, switches: ['--incognito']

Answer 2

For Firefox (I am not sure about the other browsers), you can setup the profile to have private browsing enabled:

profile = Selenium::WebDriver::Firefox::Profile.new
profile['browser.privatebrowsing.dont_prompt_on_enter'] = true
profile['browser.privatebrowsing.autostart'] = true
b = Watir::Browser.new :firefox, :profile => profile

This was the solution from https://github.com/watir/watir-webdriver/issues/95. It seems to work (at least the main menu says it is private browsing).