[Python] How do I run Selenium in Xvfb?

I'm on EC2 instance. So there is no GUI.

$pip install selenium
$sudo apt-get install firefox xvfb


Then I do this:

$Xvfb :1 -screen 0 1024x768x24 2>&1 >/dev/null &

$DISPLAY=:1 java -jar selenium-server-standalone-2.0b3.jar
05:08:31.227 INFO - Java: Sun Microsystems Inc. 19.0-b09
05:08:31.229 INFO - OS: Linux 2.6.32-305-ec2 i386
05:08:31.233 INFO - v2.0 [b3], with Core v2.0 [b3]
05:08:32.121 INFO - RemoteWebDriver instances should connect to: http://127.0.0.1:4444/wd/hub
05:08:32.122 INFO - Version Jetty/5.1.x
05:08:32.123 INFO - Started HttpContext[/selenium-server/driver,/selenium-server/driver]
05:08:32.124 INFO - Started HttpContext[/selenium-server,/selenium-server]
05:08:32.124 INFO - Started HttpContext[/,/]
05:08:32.291 INFO - Started org.openqa.jetty.jetty.servlet.ServletHandler@1186fab
05:08:32.292 INFO - Started HttpContext[/wd,/wd]
05:08:32.295 INFO - Started SocketListener on 0.0.0.0:4444
05:08:32.295 INFO - Started org.openqa.jetty.jetty.Server@1ffb8dc


Great, everything should work now, right?

When I run my code:

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.common.keys import Keys

browser = webdriver.Firefox()
browser.get("http://www.yahoo.com")


I get this:

Error: cannot open display: :0

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