ubuntu bionic, x11vnc, xvfb, firefox

https://stackoverflow.com/a/16311264/5894777

Dockerfile

@@ -0,0 +1,12 @@
+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"]

xinitrc

@@ -0,0 +1 @@
+exec firefox