用selenium 的webdriver 和 firefox 浏览器做自动化测试，经常会出现 plugin container for firefox has stopped working
如下图所示：
。
解决方法：
A. 由 Plugin Container 导致的
WebDriver: Plugin Container for Firefox has stopped working.
https://code.google.com/p/selenium/issues/detail?id=3314
Found a solution:
Go to \\Program Files (x86)\Mozilla Firefox\
find plugin-container.exe
delete or rename it!
