Some other trackers, for instance, offer no way for blocked content providers to improve and get off the naughty list, and sometimes even remove companies from a list in exchange for payment. Mozilla said Focus, which is based in part on Disconnect's open source blacklist (Opens in a new window), is more transparent than many other content blockers, which are sometimes shady about the standards used to determine what gets blocked. Focus lets you block categories of trackers such as those used for ads, analytics, and social media, and also promises to increase performance on mobile devices by blocking Web fonts. The browser maker on Monday released Focus by Firefox, a free content blocker for Safari users on iOS 9. Mozilla has a new app for privacy-conscious individuals who use Safari to browse the Web on their Apple device.
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