selenium.common.exceptions.WebDriverException: Message: "Can't load the profile.

使用selenium操作firefox出现以下问题：

Traceback (most recent call last):
  File "zs.py", line 6, in 
    browser = webdriver.Firefox()
  File "/usr/lib/python2.6/site-packages/selenium/webdriver/firefox/webdriver.py", line 58, in __init__
    self.binary, timeout),
  File "/usr/lib/python2.6/site-packages/selenium/webdriver/firefox/extension_connection.py", line 47, in __init__
    self.binary.launch_browser(self.profile)
  File "/usr/lib/python2.6/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 48, in launch_browser
    self._wait_until_connectable()
  File "/usr/lib/python2.6/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 95, in _wait_until_connectable
    self.profile.path, self._get_firefox_output()))
selenium.common.exceptions.WebDriverException: Message: 'Can\'t load the profile. Profile Dir: /tmp/tmpOGd4Im Firefox output: Xlib:  extension "RANDR" missing on displa
y ":1".\n*** LOG addons.xpi: startup\n*** LOG addons.xpi: checkForChanges\n*** LOG addons.xpi: No changes found\n'

selenium.common.exceptions.WebDriverException: Message: "Can't load the profile. 
Profile Dir: c:\\users\\rachelc\\appdata\\local\\temp\\tmp7pjtay Firefox output 
: 
*** LOG addons.xpi: startup\r\n 
*** LOG addons.xpi: Skipping unavailable install location app-system-local\r\n 
*** LOG addons.xpi: Skipping unavailable install location app-system-share\r\n 
*** LOG addons.xpi: checkForChanges\r\n" 

原因：selenium的版本过低，不支持相应的Firefox的版本；

解决办法：下载最新的selenium进行安装；