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与我的Ruby代码我想开Tor浏览器，而不是Firefox的，为了这个，我试过这个代码如何使用watir打开tor浏览器？
path='C:\Tor Browser\App\tor.exe'
Selenium::WebDriver::Firefox.path = path
driver = Selenium::WebDriver.for :firefox
ie = Watir::Browser.new :firefox, :driver => driver
我得到这个错误
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/launcher.rb:79:in `connect_until_stable': unable to obtain stable firefox connection in 60 seconds (127.0.0.1:7055) (Selenium::WebDriver::Error::WebDriverError)
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/launcher.rb:37:in `block in launch'
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/socket_lock.rb:20:in `locked'
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/launcher.rb:32:in `launch'
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/bridge.rb:24:in `initialize'
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/common/driver.rb:31:in `new'
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/common/driver.rb:31:in `for'
from c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver.rb:67:in `for'
from C:/new_trademap/newTrademapTest.rb:28:in `<main>'
我应该有什么关系？还是有其他方法可以这样做？