I have not seen the ad and hence speak somewhat uninformed. I will just present and alternate view. I think a lot of people will be unaware about the fact that

I have not seen the ad and hence speak somewhat uninformed. I will just present and alternate view. I think a lot of people will be unaware about the fact that in terms of sharing information with your ISP and others, you are no more secure by using "private browsing". If Mozilla can help educate some of these people, then I cannot fault them for that. But as I started by saying I have not seen the actual ad, just trying to present an alternate view.