A repo for Firefox Nightly ?

[Some Body <somebody.mozfr@gmail.com>]

I'm trying to install the latest Firefox Nightly (test builds released
each day) on my laptop.

On Ubuntu, there is a PPA that ships fairly recent versions of Nightly.
But on Debian, I can't find such repository.

I use the mozilla.debian.net repo to get the latest stable Iceweasel. I
see that there is an "aurora" channel in this repo, but I thought
Firefox Aurora didn't exist anymore.

Is this "aurora" version Nightly ? And if not, how can I properly
install and update Firefox/Iceweasel Nightly on Jessie ?

Thanks.