Using a custom firefox profile with Coypu

CoypuCustomProfile.cs

[Test]
public void CustomProfile()
{
    Configuration.Driver = typeof (CustomFirefoxProfileSeleniumWebDriver);

    Browser.Session.Visit("https://www.relishapp.com/");
}

public class CustomFirefoxProfileSeleniumWebDriver : SeleniumWebDriver
{
    public CustomFirefoxProfileSeleniumWebDriver() : base(CustomProfile())
    {
    }

    private static RemoteWebDriver CustomProfile()
    {
        var yourCustomProfile = new FirefoxProfile();
        return new FirefoxDriver(yourCustomProfile);
    }
}

Is this gist still workiing? I get the following exception: Argument type 'OpenQA.Selenium.Remote.RemoteWebDriver' is not assignable to parameter type 'Coypu.Drivers.Browser'