deb http://deb.debian.org/debian stretch main
deb-src http://deb.debian.org/debian stretch main

deb http://deb.debian.org/debian stretch-updates main
deb-src http://deb.debian.org/debian stretch-updates main

#Disable these, as the new versions of firefox or chromium installed crash immediately see issue #29
#deb http://security.debian.org/debian-security/ stretch/updates main
#deb-src http://security.debian.org/debian-security/ stretch/updates main