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2 cleanup instructions, particularly 030 pointing out the missing dirmngr
source | link

While still broken on standard Raspbian, Firefox 57 works on the Pi 3 with a 64-bit OS. I'm using this procedure to install:

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
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:arm64

(as roughly instructed in the thread that @0pendev linked)

To your original point of potentially reduced RAM usage: from what I can tell it consistently uses 50 MB more RAM than firefox-esr (250 MB vs 200 MB), whether opened to its default search page or raspberrypi.stackexchange.com. It does sometimes drop by 50 MB if I Alt+Tab away, but the same can be said for ESR (Firefox 52).

While still broken on standard Raspbian, Firefox 57 works on the Pi 3 with a 64-bit OS. I'm using this procedure to install:

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
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

(as roughly instructed in the thread that @0pendev linked)

To your original point of potentially reduced RAM usage: from what I can tell it consistently uses 50 MB more RAM than firefox-esr (250 MB vs 200 MB), whether opened to its default search page or raspberrypi.stackexchange.com. It does sometimes drop by 50 MB if I Alt+Tab away, but the same can be said for ESR (Firefox 52).

While still broken on standard Raspbian, Firefox 57 works on the Pi 3 with a 64-bit OS. I'm using this procedure to install:

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
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A6DCF7707EBC211F
sudo apt update && sudo apt install firefox:arm64

(as roughly instructed in the thread that @0pendev linked)

To your original point of potentially reduced RAM usage: from what I can tell it consistently uses 50 MB more RAM than firefox-esr (250 MB vs 200 MB), whether opened to its default search page or raspberrypi.stackexchange.com. It does sometimes drop by 50 MB if I Alt+Tab away, but the same can be said for ESR (Firefox 52).

1
source | link

While still broken on standard Raspbian, Firefox 57 works on the Pi 3 with a 64-bit OS. I'm using this procedure to install:

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
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

(as roughly instructed in the thread that @0pendev linked)

To your original point of potentially reduced RAM usage: from what I can tell it consistently uses 50 MB more RAM than firefox-esr (250 MB vs 200 MB), whether opened to its default search page or raspberrypi.stackexchange.com. It does sometimes drop by 50 MB if I Alt+Tab away, but the same can be said for ESR (Firefox 52).