Python

Here is some Python code showing WebDriver with a virtual display provided by Xvfb:

    
#!/usr/bin/env python

from pyvirtualdisplay import Display
from selenium import webdriver

display = Display(visible=0, size=(800, 600))
display.start()

# now Firefox will run in a virtual display. 
# you will not see the browser.
browser = webdriver.Firefox()
browser.get('http://www.google.com')
print browser.title
browser.quit()

display.stop()

install PyVirtualDisplay on Ubuntu/Debian:

$ sudo apt-get install xvfb python-pip
$ sudo pip install pyvirtualdisplay