Unable to set a specific preference in FireFox

Hello!

Here is my Python code:

Code:

from selenium import webdriver
import time

firefox_profile = webdriver.FirefoxProfile()
firefox_profile.set_preference('permissions.default.image', 2)
firefox_profile.set_preference('permissions.default.stylesheet', 2)
firefox_profile.set_preference('dom.ipc.plugins.enabled.libflashplayer.so', 'false')

driver = webdriver.Firefox(firefox_profile=firefox_profile)
driver.get('url')

#driver.close()

My goal is to stop images, style-sheets and flash from loading to speed up the process as much as possible.
No matter what I do, "permissions.default.image" stays 1. I am still able to manually set it in the browser window that opens, and then it works.
"permissions.default.stylesheet" is set to 2 and works as expected.

What is going on here??

Please post your question in official webdriver forum  - 
www.seleniumtests.com/p/selenium-2-forum.html

Not sure,  may be check FF version and standalone version.... try with latest version of Bothj application

Please post your question in official webdriver forum  - 
www.seleniumtests.com/p/selenium-2-forum.html