I'm looking for a super small image for my Pi < 1 gigabyte. I need it to fit within the memory of the Pi.
I only have 4 requirements: long term availability, a Gui, Firefox, and ethernet drivers.
What can we do?
Have a look at Tiny Core Linux, see here: https://www.zdnet.com/article/hands-on-with-picore-7-0-tiny-core-linux-for-the-raspberry-pi/
What have you found so far in your searching?