From: Alex Moonshine <moonshine@openmailbox.org>
To: debian-user@lists.debian.org
Sent: Monday, November 2, 2015 12:37 PM
Subject: Re: where does unstable appear from?
Testing/unstable is just a common release name for testing AND unstable.
Your sources.list is fine. Filezilla package isn't present in
testing/stretch (see
https://packages.debian.org/wheezy/filezilla). In
fact, if you were running sid, you'd be able to install it.