docker-firefox-vnc/Dockerfile

FROM ubuntu:18.04

RUN apt-get update && apt-get install --yes --no-install-recommends \
    firefox \
    x11vnc \
    xvfb

RUN useradd --create-home vnc
COPY --chown=vnc xinitrc /home/vnc/.xinitrc
USER vnc
EXPOSE 5900/tcp
CMD ["x11vnc", "-create", "-nopw", "-no6"]