Setup Centos 6 with Firefox using Xvfb for karma testing

xvfb-setup.sh

# Install necessary software
sudo yum install firefox xorg-x11-server-Xvfb dbus -y

# Set DISPLAY id, should go to /etc/profile.d/xvfb.sh
export DISPLAY=:99

# Generate machine id if doesn't already generated in /var/lib/dbus/machine-id
sudo /bin/dbus-uuidgen --ensure

# Download xvfb to /etc/init.d/xvfb
sudo curl https://gist.githubusercontent.com/elmariofredo/6f55d65e5c5a5e9d995b/raw/6fb3104d3d9c5dec43a79be25fe4cb7ce7091b79/xvfb -o /etc/init.d/xvfb

# Make init script executable
sudo chmod +x /etc/init.d/xvfb

# Add to init
sudo /sbin/chkconfig --add xvfb

# Start xvfb service
service xvfb start