Dec 12th, 2017 Here are all of the official versions of Firefox for Android
In short, Firefox Beta gives you access to safety, performance, and customization improvements before they're released in the normal version of Firefox. You can enjoy new features before anyone else, and also have a hand in improving any important aspects of the app, ultimately helping the company progress and evolve.
This app looks exactly like the normal version of the browser, aside from some features that might be included in the future. You can save your favorite websites, create shortcuts to the sites you visit most, share links on social networks, and easily sync extensions. You can browse and enjoy Firefox, while you also contribute to its community by just using it.