Firefox version supported by selenium webdriver 2.25.0 - ruby-on-rails-3

I restarted working on an older rails project today. One problem driving me crazy is that I can't get my javascript test cases to run, although I remember them all passing when I left the project. I am using
selenium-webdriver 2.25.0
capybara 1.1.2
cucumber 1.2.1
but firefox doesn't start when I run the tests. All I get is
unable to start Firefox cleanly, args: ["-silent"]
(Selenium::WebDriver::Error::WebDriverError)
I guess this is because of updating firefox and I tried to install several older versions but none of them works. Which version is supported by selenium-webdriver 2.25.0?

Yes, this is annoying. I just upgrade the driver and it usually does the trick:
bundle update selenium-webdriver

Selenium Webdriver 2.25 supports Firefox up to version 17

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Thanks
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