So with all the name changes and maybe confusion, and in between the automatic update does not seem yet to work correctly here are the links that one can follow to pick up the latest version - Nightly (forget about Minefield, the name is being retired)
. Here one notes that the 64-bit is running sometimes 1-2 days (or more) behind- Aurora (aka Future of Firefox).
- we have here 3 downloads to choose from, Aurora itself which is pretty much the nightly builds, Beta which is officially being released to the public and serves as the springboard to the official version of Firefox, and the Beta Mobile- Firefox itself as latest stable official version
My preference? I am switching between Aurora and Nightly builds. Aurora when I need to some of the extensions.
Hope this would clear up some of the current confusion.