watir-webdriver启动Firefox遇到unable to find profile named: "default"

谷歌了一下，貌似没人遇到这样的情况，我在这记录一下吧：

更新火狐到22版本，发现加了很多乱七八糟的插件，同事启动Firefox会卡住脚本，没办法，只能屏蔽掉这些插件。但是我们会发现，你手动打开的Firefox和脚本启动的Firefox是不一样的，我手动修改了配置保存了，脚本启动的火狐依然是最初的设置，尝试了一些方法，比如add_extensions方法什么的都不行。

后来发现，其实只需要手动修改一下配置，然后profile用default就可以了。

按照官方的例子写：

Watir::Browser.new :firefox, :profile => 'default'

不过今天有发现个新问题，就是有部分机器运行的时候会提示如下错误：

D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/firefox/launcher.rb:88:in `fetch_profile': unable to find profile named: "default" (Selenium::WebDriver::Error::WebDriverError)
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/firefox/launcher.rb:53:in `create_profile'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/firefox/launcher.rb:34:in `block in launch'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/firefox/socket_lock.rb:20:in `locked'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/firefox/launcher.rb:32:in `launch'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/firefox/bridge.rb:24:in `initialize'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/common/driver.rb:31:in `new'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver/common/driver.rb:31:in `for'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.32.1/lib/selenium/webdriver.rb:67:in `for'
from D:/ruby193/lib/ruby/gems/1.9.1/gems/watir-webdriver-0.6.2/lib/watir-webdriver/browser.rb:46:in `initialize'

解决办法：

default_profile=Selenium::WebDriver::Firefox::Profile.from_name "default"
b = Watir::Browser.new :firefox, :profile => default_profile