Download Firefox 45 ESR for 64 bits from: https://www.mozilla.org/en-US/firefox/organizations/all/

Install the required libraries:

$ sudo apt-get install openjdk-8-jre icedtea-plugin

Uncompress firefox tarball and execute it.

Download Firefox 52 ESR for 32 bits from: https://www.mozilla.org/en-US/firefox/organizations/all/

$ sudo dpkg --add-architecture i386
$ sudo apt-get updatelibxt6:i386
$ sudo apt-get install libxcomposite1:i386 libdbus-glib-1-2:i386 libgtk2.0-0:i386 libxt6:i386