code: def is_private(self):
          
          self.switch_to()
          with self.selenium.context(self.selenium.CONTEXT_CHROME):
              return self.selenium.execute_script(
                  """
                  Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
  
                  let chromeWindow = arguments[0].ownerDocument.defaultView;
                  return PrivateBrowsingUtils.isWindowPrivate(chromeWindow);
                  """,
                  self.document_element,
              )
docs: Property that checks if the specified window is private or not.
  
          Returns:
              bool: True if this is a Private Browsing window.