Firefox Focus
Your phone's browser most likely has a "private" mode built in, but a lot of times it doesn't do enough to completely protect your privacy. That's where Firefox Focus comes in. Backed by Mozilla, it automatically blocks a wide range of tracking tools, keeping you from being followed by advertisers and potentially unsavory suspects. It makes it extremely easy to erase your history, passwords, and cookies, and since many of the trackers it blocks are advertising-related, it might just speed up your browsing experience while cutting your data usage.