First version: run Firefox

Dockerfile

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+FROM ubuntu:bionic
+
+RUN apt-get update && apt-get install -y firefox
+RUN export uid=1000 gid=1000 && \
+    mkdir -p /home/user && \
+    echo "user:x:${uid}:${gid}:User,,,:/home/user:/bin/bash" >> /etc/passwd && \
+    echo "user:x:${uid}:" >> /etc/group && \
+    chown ${uid}:${gid} -R /home/user
+
+USER user
+
+COPY files/user.js /home/user/
+COPY files/start.sh /home/user/
+
+ENV HOME /home/user
+CMD /bin/bash /home/user/start.sh

build.sh

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+#!/bin/sh
+docker build -t docker-vpn-browser .

files/start.sh

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+#!/bin/bash
+set -e
+
+# If no profile ...
+if [ ! -d "$HOME/.mozilla" ]; then
+  # create the default Firefox profile and put some settings there
+  firefox -CreateProfile default
+  mv $HOME/user.js `find $HOME/.mozilla/firefox -type d | grep .default`
+fi
+
+# Start firefox
+firefox

files/user.js

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+// Place in ~/.mozilla/user.js
+
+// Firefox often crashes without this setting
+// https://askubuntu.com/questions/966332/firefox-56-0-64-bit-crashing-tabs-after-upgrade
+user_pref("browser.tabs.remote.autostart", false);

run.sh

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+#!/bin/sh
+docker run -ti --rm -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix docker-vpn-browser