wd_base = (
    'C:\\Python27\\Lib\\site-packages\\selenium-2.44.0-py2.7.egg    \\selenium\\webdriver'
    )
RequiredDataFailes = [('selenium/webdriver/firefox', [
    '%s\\firefox\\webdriver.xpi' % wd_base, 
    '%s\\firefox\\webdriver_prefs.json' % wd_base])]
Python - Trouble in building executable