Hi, I install the new web driver (2.40) for C# with NuGet packages for Firefox, after
that the build works but on run-time I got this error {"Preference browser.download.manager.showWhenStarting
may not be overridden: frozen value=False, requested value=False"} <- the inner excetion.

My code:

FirefoxProfile profile = new FirefoxProfile();
profile.SetPreference("browser.download.manager.showWhenStarting", false);
webdriver = new FirefoxDriver(profile);

The code crashes on second line. this Reproduce only for Firefox since I get the firefox
webdriver and it crashes on all test cases.

Selenium version: 2.4
OS: windows 7 64 bit
Browser: Firefox
Browser version: 27