Run applications headless

Install the following: Xvfb, startx, import (from ImageMagick)
Now let’s try to run Firefox without a visible display.

• Start Xvfb.

 startx -- `which Xvfb` :1 -screen 0 1024x768x24

• start Xvfb running on :1 with a screen size of 1024×768 and 24bits/pixel color depth.

 DISPLAY=:1 firefox

• Take a screenshot.

 DISPLAY=:1 import -window root firefox.png