Many modern smartphone web browsers have private modes. They're rarely turned on by default, however, and you may have to wade through settings just to make sure you're a ghost online. Mozilla wants to try something different: it's launching a browser for iOS that revolves around privacy. Firefox Focus isn't very sophisticated (you don't even get multiple tabs), but it blocks ad, analytics and social trackers by default, with simple sliders used to turn tracking on and off. Also, see that conspicuous "erase" button up top? Hit that and it immediately wipes your current browser history -- all the evidence of your gift shopping goes away in a moment.