Firefox Nightly

Firefox Nightly (previously known as Aurora) is a distribution channel for the well-known Mozilla browser. This way, you can test newly released versions before they're officially released. It's a great way for the developers to see how their tools and websites will work in future updates.

Although the browser is totally functional, it's an alpha version so it can be a bit unstable. You'll also see latest features that have been added much earlier than the rest of the users that update only once the version is stable.

Testing new versions of Firefox gives valuable information to its developers so they can refine it for the beta implementation, and then the finalized version that everyone uses.