======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
<code>
deb http://mozilla.debian.net/ jessie-backports firefox-release
</code>
# vi /etc/apt/preferences.d/mozilla-firefox
<code>
Package: *
Pin: origin mozilla.debian.net
Pin-Priority: 501
</code>
# apt-get update
# apt-cache policy firefox
# apt-get install firefox-esr-l10n-ja

参考
https://blog.sleeplessbeastie.eu/2016/03/21/how-to-use-recent-version-of-firefox-in-debian-jessie/