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• http://docs.seleniumhq.org/download/

Well, thank you for your reply.

I had solved the problem. It does nothing with driver itself.

I didn't install the firefox in the default fold. So the driver bin can't find firefox.exe. Change it as followed.

                       // the path you install firefox

File pathToFirefoxBinary = new File("C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe"); FirefoxBinary firefoxbin = new FirefoxBinary(pathToFirefoxBinary); firefox = new FirefoxDriver(firefoxbin, null);