selenium和Firefox版本不兼容

selenium8.py

coding = utf-8

from selenium import webdriver
driver = webdriver.Firefox()
driver.get('http://www.baidu.com')
print (driver.title)
driver.quit()

运行报错：

Python 3.3.5 (v3.3.5:62cf4e77f785, Mar 9 2014, 10:37:12) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.

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Traceback (most recent call last):
File "C:\Python33\selenium8.py", line 3, in
driver = webdriver.Firefox()
File "C:\Python33\lib\site-packages\selenium-2.45.0-py3.3.egg\selenium\webdriver\firefox\webdriver.py", line 59, in init
self.binary, timeout),
File "C:\Python33\lib\site-packages\selenium-2.45.0-py3.3.egg\selenium\webdriver\firefox\extension_connection.py", line 47, in init
self.binary.launch_browser(self.profile)
File "C:\Python33\lib\site-packages\selenium-2.45.0-py3.3.egg\selenium\webdriver\firefox\firefox_binary.py", line 66, in launch_browser
self._wait_until_connectable()
File "C:\Python33\lib\site-packages\selenium-2.45.0-py3.3.egg\selenium\webdriver\firefox\firefox_binary.py", line 105, in _wait_until_connectable
raise WebDriverException("Can't load the profile. Profile "
selenium.common.exceptions.WebDriverException: Message: Can't load the profile. Profile Dir: %s If you specified a log_file in the FirefoxBinary constructor, check it for details.

估计很多朋友都遇到过啊，网上搜了下是版本问题。
我的selenium版本是selenium-2.45.0，安装的fireFox最新的47版本，结果就报错了。
fireFox更新的快，但是selenium总是慢半拍。
反正现在是学习嘛，换FireFox版本吧
也不知道selenium-2.45.0，到底支持哪个版本的FireFox，百度搜索到一篇之前的文章说selenium-2.45.0，新发布了，支持FireFox36
一下子降低了11个版本号，好吧，反正是学习。
卸载新的FireFox，安装了36的版本。

接着运行：

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百度一下，你就知道

看来是通过了。
那么接下来就是学习selenium了，嘿嘿。又前进了一步！！