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I am trying to launch Mozilla but still, I am getting this error:

Exception in thread "main" java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.gecko.driver system property; for more information, see The latest version can be downloaded from

I am using Selenium 3.0.01 Beta version and Mozilla 45. I have tried with Mozilla 47 too. but still the same thing.

1 Answer

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The selenium client bindings can attempt to find the geckodriver executable from the system PATH. You will have to add the directory containing the executable to the system path.

On UNIX systems you'll do the following to append it to your system’s search path if you’re employing a bash-compatible shell:

export PATH=$PATH:/path/to/geckodriver

On Windows, you wish to update the path system variable to feature the complete directory path to the executable. The principle is the same as on Unix. All below configuration for launching the latest firefox using any programing language binding is applicable for Selenium2 to enable marionette explicitly. With selenium 3.0 and later, you should not need to do anything to use marionette, as it's enabled by default.

To use marionette in your tests you may have to update your required capabilities to use it.


//if you didn't update the Path system variable to add the full directory path to the executable as above mentioned then doing this directly through code

System.setProperty("webdriver.gecko.driver", "path/to/geckodriver.exe");

//Now you can Initialize marionette driver to launch firefox

DesiredCapabilities capabilities = DesiredCapabilities.firefox();

capabilities.setCapability("marionette", true);

WebDriver driver = new MarionetteDriver(capabilities); 

And for Selenium3 use as:-

WebDriver driver = new FirefoxDriver();

.NET :

var driver = new FirefoxDriver(new FirefoxOptions());

Python :

from selenium import webdriver

from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

caps = DesiredCapabilities.FIREFOX

# Tell the Python bindings to use Marionette.

# This will not be necessary for the future,

# when Selenium will auto-detect what remote end

# it is talking to.

caps["marionette"] = True

# Path to Firefox DevEdition or Nightly.

# Firefox 47 (stable) is currently not supported,

# and may give you a suboptimal experience.


# On Mac OS you must point to the binary executable

# inside the application package, such as

# /Applications/

caps["binary"] = "/usr/bin/firefox"

driver = webdriver.Firefox(capabilities=caps)

Ruby :

# Selenium 3 uses Marionette by default when firefox is specified

# Set Marionette in Selenium 2 by directly passing marionette: true

# You might need to specify an alternate path for the desired version of Firefox

Selenium::WebDriver::Firefox::Binary.path = "/path/to/firefox"

driver = Selenium::WebDriver.for :firefox, marionette: true

JavaScript (Node.js) :

const webdriver = require('selenium-webdriver');

const Capabilities = require('selenium-webdriver/lib/capabilities').Capabilities;

var capabilities = Capabilities.firefox();

// Tell the Node.js bindings to use Marionette.

// This will not be necessary in the future,

// when Selenium will auto-detect what remote end

// it is talking to.

capabilities.set('marionette', true);

var driver = new webdriver.Builder().withCapabilities(capabilities).build();

If you are interested to learn Selenium on a much deeper level and want to become a professional in the testing domain, check out Intellipaat’s Selenium 3.0 certification

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