sudo apt install dirmngr echo "deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu trusty main" | sudo tee /etc/apt/sources.list.d/firefox.list echo "deb-src http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu trusty main" | sudo tee /etc/apt/sources.list.d/firefox-source.list echo "deb http://ppa.launchpad.net/mozillateam/thunderbird-next/ubuntu trusty main" | sudo tee /etc/apt/sources.list.d/thunderbird.list echo "deb-src http://ppa.launchpad.net/mozillateam/thunderbird-next/ubuntu trusty main" | sudo tee /etc/apt/sources.list.d/thunderbird-source.list sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A6DCF7707EBC211F sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9BDB3D89CE49EC21 sudo apt update && sudo apt install firefox thunderbird
Reference: https://www.raspberrypi.org/forums/viewtopic.php?t=150438
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