old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  import subprocess
  
  from selenium.webdriver import Firefox
  from selenium.webdriver.firefox.firefox_profile import FirefoxProfile
  from splinter.driver.webdriver import BaseWebDriver, WebDriverElement as BaseWebDriverElement
  from splinter.driver.webdriver.cookie_manager import CookieManager
  
  
  class WebDriver(BaseWebDriver):
  
      def __init__(self, profile=None, extensions=None):
          self.old_popen = subprocess.Popen
          firefox_profile = FirefoxProfile(profile)
          firefox_profile.set_preference('extensions.logging.enabled', False)
  
          if extensions:
              for extension in extensions:
                  firefox_profile.add_extension(extension)
  
          self._patch_subprocess()
          self.driver = Firefox(firefox_profile)
          self._unpatch_subprocess()
  
          self.element_class = WebDriverElement
  
          self._cookie_manager = CookieManager(self.driver)
  
          super(WebDriver, self).__init__()
  
  
  class WebDriverElement(BaseWebDriverElement):
  
      def mouseover(self):
          """
          Firefox doesn't support mouseover.
          """
          raise NotImplementedError("Firefox doesn't support mouse over")
  
      def mouseout(self):
          """
          Firefox doesn't support mouseout.
          """
          raise NotImplementedError("Firefox doesn't support mouseout")
  
      def double_click(self):
          """
          Firefox doesn't support doubleclick.
          """
          raise NotImplementedError("Firefox doesn't support doubleclick")
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  import subprocess
  
  from selenium.webdriver import Firefox
  from selenium.webdriver.firefox.firefox_profile import FirefoxProfile
  from splinter.driver.webdriver import BaseWebDriver, WebDriverElement as BaseWebDriverElement
  from splinter.driver.webdriver.cookie_manager import CookieManager
  
  
  class WebDriver(BaseWebDriver):
  
      def __init__(self, profile=None, extensions=None):
          self.old_popen = subprocess.Popen
          firefox_profile = FirefoxProfile(profile)
          firefox_profile.set_preference('extensions.logging.enabled', False)
          firefox_profile.set_preference('network.dns.disableIPv6', False)
  
          if extensions:
              for extension in extensions:
                  firefox_profile.add_extension(extension)
  
          self._patch_subprocess()
          self.driver = Firefox(firefox_profile)
          self._unpatch_subprocess()
  
          self.element_class = WebDriverElement
  
          self._cookie_manager = CookieManager(self.driver)
  
          super(WebDriver, self).__init__()
  
  
  class WebDriverElement(BaseWebDriverElement):
  
      def mouseover(self):
          """
          Firefox doesn't support mouseover.
          """
          raise NotImplementedError("Firefox doesn't support mouse over")
  
      def mouseout(self):
          """
          Firefox doesn't support mouseout.
          """
          raise NotImplementedError("Firefox doesn't support mouseout")
  
      def double_click(self):
          """
          Firefox doesn't support doubleclick.
          """
          raise NotImplementedError("Firefox doesn't support doubleclick")
  
subject: Fix error on Firefox 6 where pages are not open if this preference is True (default).