Firefox Nightly for Developers

As the name suggests, Firefox Aurora is not a stable release, and it’s aimed mostly at developers and less at regular users. Nonetheless, anyone can install it and use it. If you want to see what Mozilla is planning for the future with its mobile browser, this is the perfect way to do it.
 
Unlike other versions of the browser, Firefox Aurora automatically sends feedback to Mozilla, for obvious reasons. Since this is a development version of the browser, the want all the details regarding usage and crashes.
It’s also worth pointing out that since Firefox Aurora is still in development, it’s going to be prone to crashing and other issues, so don’t use this as your regular browser.