Compiling Firefox doesn't work

Hi!

New to docker, I am trying to compile Firefox to be able to benchmark Docker on my computer as it is quite a large task. I’ve taken the image from James Turner found here: https://jamesturner.im/2017/08/26/building-firefox-in-docker.html

Running this image results in the error: “The command ‘/bin/sh -c python /tmp/bootstrap.py --application-choice=browser --no-interactive’ returned a non-zero code: 1” which I cannot find any information on.

Anyone know what is wrong?

Best regards