Firefox Nightly is a developmental channel which can be used for obtaining experimental builds of Firefox. Users belonging to this channel are able to test newest features of this popular web browser, and to provide feedback to its developers. Based on this information, they can decide which features and updates will be released in the main version of Firefox.
Keep in mind that the package also provides the actual browser and you can use most of its features. Taking into consideration that it contains a variety of experimental components, you will face an an unstable environment. If you love browsing the World Wide Web without having to be worried regarding tracking, you can simply activate the included Private Browsing module.
This small feature will prevent the app from keeping a list of your visited pages, cookies, etc. In addition, the sharing function allows users to share content with other people via multiple solutions like Bluetooth, instant messaging apps, Facebook, Gmail, and so on. You can extend the functionality of this web browser by going inside the Add-on section and find some useful extensions.