How can I install GNU IceCat on a Debian-based system?

[GNU IceCat](https://www.gnu.org/software/gnuzilla/) is the primary target for the [LibreJS extension](https://www.gnu.org/software/librejs/) , making it a stable platform for running that extension. So, I'd like to install Ice Cat on my Debian-based systems (running Debian, Ubuntu and PureOS). How can I do this? I'm happy to do crazy things up to and including using the Guix package manager, as long as I can launch the browser in a regular GNOME/Wayland session.