DOCKERFILE:

FROM ubuntu:trusty
MAINTAINER Dean Kayton <deankayton@gmail.com>
ENV DEBIAN_FRONTEND noninteractive
RUN dpkg --add-architecture i386
RUN apt-get update && apt-get -y install \
    firefox:i386 \
    fonts-takao \
    icedtea-7-plugin:i386 \
    libcanberra-gtk-module:i386 \
    libpangox-1.0-0:i386 \
    libpangoxft-1.0-0:i386 \
    libxft2:i386 \
    libxmu6:i386 \
    libxv1:i386 \
    openjdk-7-jre:i386
ARG webex_passw
RUN adduser \
    --quiet \
    --disabled-password \
    --gecos "" \
    webex && \
    echo "webex:${webex_passw}" | chpasswd
USER webex
WORKDIR /home/webex/
ENTRYPOINT ["/bin/bash"]
CMD ["/usr/bin/firefox", "go.webex.com"]

BUILD COMMAND (Only issue this command if you want to build the image yourself):

sudo docker build \
    --tag=docker-webex \
    --build-arg webex_passw="replace_password_here" \
    --rm \
    .

RUN COMMAND (This is the only command you need to issue, the rest takes place automatically):

sudo docker run -it \
    --env DISPLAY=unix$DISPLAY \
    --privileged \
    --name=docker-webex \
    --volume /dev/snd:/dev/snd \
    --volume /tmp/.X11-unix:/tmp/.X11-unix \
    dnk8n/docker-webex:latest $1

Password for user, webex on dockerhub image, dnk8n/docker-webex:latest is "webex"