Because of privacy. The various turbo settings send all your traffic through a computer that the browser controls. This means that the company can see all your traffic. It also means that the company can be subject to law enforcement requests to view the data you are browsing.

If privacy is the problems why the option don't track there ghost addons which make troubles also when I reply it comes there it makes difficult to me reply why woudn't you make update for Mozilla if privacy is the problem as you say then give us option for that browsing settings in your apps and software so people can choose what they like and the turbo settings and get faster browsing please make update for this