Bug#817954: Keep Firefox out of Debian releases

[Francesco]

Source: firefox
Followup-For: Bug #817954

Dear Maintainer,

If possible it would be nice to have firefox (release version,
not esr) in stretch/testing without adding unstable repository;
maybe can be added a section in the repository used for stable too.



-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.4.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=it_IT.utf8, LC_CTYPE=it_IT.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)