Instead of using a pre-defined list of which trackers to block, the software learns to block invisible trackers based on their behavior. It stops advertisers and other third-party trackers from secretly tracking users on the web. Privacy Badger is yet another offering from the EFF and another must-have piece of software for all Firefox users across all platforms. It was developed by the Electronic Frontier Foundation (EFF) and protects online communications by enabling https encryption automatically on supported sites. Another excellent add-on for Firefox on Android is https Everywhere. It is also free and open-source software that doesn't show ads and doesn't collect user data. It works as advertised by inverting colors on websites, making them high contrast and easy to read at night. One of the best Firefox add-ons on Android is Dark Reader, which adds a dark mode to any site, making web surfing less strenuous on the eyes. Related: These Are The Best Privacy Browsers On Android

While most versions are based on the Gecko rendering engine, the iOS version uses WebKit due to Apple's stringent platform requirements. It is also available for various Unix and Unix-like operating systems, including FreeBSD, OpenBSD, NetBSD, Illumos and Solaris. The non-profit Mozilla Foundation makes Firefox available on all major desktop and mobile platforms, including Windows, Linux, macOS, Android and iOS. The free and open-source Firefox is one of the leading browsers on both desktop and mobile.

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