firefox devel versions

[AN]

The latest version of Firefox now reports as:
Firefox ESR 10.0.3  What does this mean?

Is it possible to build firefox-nightly, or aurora on FreeBSD?  I see the 
following directories here:
https://trillian.chruetertee.ch/svn/freebsd-gecko/branches/experimental/www/firefox/
firefox-beta/
firefox-i18n/
firefox36/
firefox36-i18n/
kompozer/
libxul/
linux-firefox/
linux-seamonkey/
seamonkey/
seamonkey-beta/
seamonkey-i18n/
xpi-adblock/

but no aurora or nightly.


Tha Makefile in in the beta directory says:
# New ports collection makefile for:	phoenix
# Date created:			2002/10/21
# Whom:				Alan Eldridge <alane at FreeBSD.org>
#
# $FreeBSD: ports/www/firefox/Makefile,v 1.259 2011/12/22 21:00:50 beat 
Exp $
#

PORTNAME=	firefox
DISTVERSION=	10.0
PORTEPOCH=	1
CATEGORIES=	www ipv6
MASTER_SITES=	${MASTER_SITE_MOZILLA}
MASTER_SITE_SUBDIR=	${PORTNAME}/releases/${DISTVERSION}/source
DISTNAME=	${PORTNAME}-${DISTVERSION}.source

So how do you build the most current version of FF?

Thanks in advance...