Why is Selenium 2.53.0 Incompatible with Firefox 47.0?

Selenium 2.53 Compatibility with Firefox 47

When attempting to use WebDriver with Firefox, an encounter with an error is possible:

org.openqa.selenium.firefox.NotConnectedException: Unable to connect
to host 127.0.0.1 on port 7055 after 45000 ms.

Environment Details:

• Firefox version: 47.0
• Selenium: 2.53.0
• Windows 10 64-bit

Cause and Solution

Unfortunately, Selenium WebDriver 2.53.0 is incompatible with Firefox 47.0. The older WebDriver component that handled Firefox browsers (FirefoxDriver) is being phased out. Starting from version 3.0, Selenium WebDriver requires the geckodriver binary to control Firefox browsers.

To resolve this issue, download the Firefox driver (geckodriver) and set the webdriver.gecko.driver variable to its absolute path using Java's system properties:

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

Alternatively, you can leverage the WebDriverManager library to automate this process, which downloads the appropriate Marionette binary based on your operating system and assigns it to the system property. Include the following dependency in your project:

<dependency>
    <groupId>io.github.bonigarcia</groupId>
    <artifactId>webdrivermanager</artifactId>
    <version>5.1.0</version>
</dependency>

Then, execute the following line before using WebDriver:

WebDriverManager.firefoxdriver().setup();

Additional Notes

Marionette is the future for Firefox browser automation, replacing WebDriver 3 and Firefox 48 . However, its stability at the moment (version 0.9.0) is questionable. Refer to the Marionette roadmap for details.

Recent Update

On June 30th, 2016, Selenium WebDriver 2.53.1 was released, restoring FirefoxDriver's compatibility with Firefox 47.0.1.

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