Hi I should be able to help with this: * Firefox Preview is the future of Firefox on the Android platform and has new technology and a new interface to make mobile browsing faster and easier. * Firefox Focus is a privacy focussed browser for qucik searches where you do not need to retain the browsing history. * Firefox Browser is our existing Android product, soon to be replaced by Firefox Preview. * Mozilla Firefox Browser is an evolution of Firefox Preview as we prepare it for a wider audience. I hope this helps.