Firefox Focus: the privacy browser, is a free mobile browser for iOS devices by Mozilla designed to protect user privacy while browsing the web.
The app "improves the privacy and performance" of a user's mobile browsing experience by "blocking analytics, social, and advertising trackers" according to the product description on Apple's iTunes website. It furthermore enables you to erase the browsing history, passwords and cookies easily.
A content blocker by Mozilla, makers of Firefox and known proponents of user rights and privacy? That's got to be good, right?
What you may not expect from the app, especially since it is designed to block analytic trackers, is that it is collecting data itself, and transfers the data it collects to third-party company Adjust.