Selenium: Unable to launch Firefox 47.0.1 on 3.3.1 grid node

[markahopwood]

OS: Windows 2012
Selenium Version:
Webdriver 3.3 .NET bindings
selenium-server-standalone-3.3.1.jar

Browser: Firefox
Browser Version: 47.0.1

Expected Behavior -

Tests can be run using RemoteWebDriver and a grid running 3.3.1

Actual Behavior -

The following exception is generated when creating a RemoteWebDriver instance:
An unhandled exception of type 'System.InvalidOperationException' occurred in WebDriver.dll

Additional information: org.openqa.selenium.remote.service.DriverCommandExecutor cannot be cast to org.openqa.selenium.firefox.FirefoxDriver$LazyCommandExecutor

Steps to reproduce -

C# code snippet below....

using System;
using OpenQA.Selenium;
using OpenQA.Selenium.Firefox;
using OpenQA.Selenium.Remote;

namespace FFStartUpProblem
{
internal class Program
{
private static void Main(string[] args)
{
IWebDriver driver;
Uri _internalSeleniumGrid = new Uri("http://x.x.x.x:4444/wd/hub");

        FirefoxProfile profile = new FirefoxProfile();
        FirefoxOptions options = new FirefoxOptions
        {
            UseLegacyImplementation = true
        };
        DesiredCapabilities capabilities = (DesiredCapabilities)options.ToCapabilities();
        capabilities.SetCapability(FirefoxDriver.ProfileCapabilityName, profile.ToBase64String());

        driver = new RemoteWebDriver(_internalSeleniumGrid, capabilities);
        driver.Navigate().GoToUrl("http://www.google.com");
        driver.Quit();
    }
}

}

The same code snippet works when using 3.2.0 grid node

[krmahadevan]

Issue reproducible with Java bindings as well
Problem is not related to Firefox browser, but it looks like its more of a code issue. I was able to reproduce this error with Selenium 3.2.0 and Selenium 3.3.1 as well.

public class Issue3644 {
    public static void main(String[] args) throws MalformedURLException {
        RemoteWebDriver driver = null;
        try {
            DesiredCapabilities firefox = new DesiredCapabilities();
            firefox.setBrowserName(DesiredCapabilities.firefox().getBrowserName());
            FirefoxOptions options = new FirefoxOptions();
            options.setLegacy(true);
            options.addDesiredCapabilities(firefox);
            Capabilities caps = options.toDesiredCapabilities();
            driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), caps);
            driver.get("http://www.google.com");
            System.err.println("Page Title ::" + driver.getTitle());
        } finally {
            if (driver != null) {
                driver.quit();
            }
        }
    }
}

[shs96c]

On it. sigh

[shs96c]

Fix has landed in 07f6b7a037e500a2c94c4a026dbcf202c695cc4c

[krmahadevan]

@shs96c - The OP raised this bug against the .NET bindings, but the above commit takes care of fixing this in the Java bindings. Just thought I would call this out since I noticed that the issue is now closed, even though its really only partially fixed

[lmtierney]

@krmahadevan what is there to fix on the .NET side? This should be covered by the fix @shs96c just landed

[krmahadevan]

@lmtierney - Dang! You are right.. the issue was in the grid part... My bad...

[schmidtkp]

@shs96c Any chance of seeing this fix rolled out (v3.3.2?) anytime soon? We use a 3.x grid and have been an early adopter of releases (Java bindings) but do rely on legacy for FF while GeckoDriver is maturing.

[jochenberger]

You can set the system property webdriver.firefox.marionette to false. That's interpreted correctly.