ツール

firefox

# wget http://mozilla.debian.net/archive.asc
# apt-key add archive.asc
# vi /etc/apt/sources.list.d/mozilla-firefox.list

deb http://mozilla.debian.net/ jessie-backports firefox-release

# vi /etc/apt/preferences.d/mozilla-firefox

Package: *
Pin: origin mozilla.debian.net
Pin-Priority: 501

# apt-get update
# apt-cache policy firefox
# apt-get install firefox-esr-l10n-ja