A Simple Guide to using Firefox Driver for Selenium to Run your Tests

June 27, 2024Supratik Ray
A Simple Guide to using Firefox Driver for Selenium to Run your Tests

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A Firefox Driver for Selenium is a web driver for the Firefox browser that allows you to programmatically interact with a web page in a Firefox browser using Selenium. It helps you automate various actions as if you were interacting with the website manually. This can be useful for tasks such as web scraping, automated testing, and automating repetitive tasks on a website.

The Significance of using GeckoDriver


GeckoDriver is used as a proxy between Selenium and the Firefox browser for your automated browser tests. The protocol followed for communication here is the Marionette automation protocol. 

Since Selenium is designed to be cross-browser compatible, GeckoDriver enables Selenium to interact with Firefox in a similar way it interacts with other browsers like Chrome, Internet Explorer and Edge, etc.

A Step-by-Step Walkthrough to setting up GeckoDriver 

Here are the steps to set up GeckoDriver for use with Selenium WebDriver:

  1. Download the latest version of GeckoDriver from the official GitHub release page.
  1. Extract the downloaded archive to a location on your system. The executable file inside the archive is the GeckoDriver.
  1. Add the location of the GeckoDriver executable to your system’s PATH environment variable. This will allow the Selenium WebDriver to locate and communicate with the GeckoDriver.
  1. In your Selenium script, import the Selenium WebDriver library and use the FirefoxDriver class, which is provided by the Selenium WebDriver to interact with the Firefox browser.
  1. Finally, use the FirefoxDriver to create a new instance of the WebDriver for Firefox. You can now interact with the Firefox browser using Selenium WebDriver commands.

After you’ve instantiated the FirefoxDriver, you can use it to interact with web pages just as you would with other web drivers like Chrome or Edge driver. For example, you can navigate to a web page using the get() method, find elements on the page using the find_element_by_*() method, and interact with those elements using methods like click() and send_keys().

It’s worth noting that Mozilla has been working to implement the WebDriver protocol in Firefox directly, and there is a plan to deprecate GeckoDriver. From Firefox ver 79 onwards, you no longer need to download and set the path for GeckoDriver; Firefox itself includes the implementation of the WebDriver protocol.

Run Tests using Selenium Firefox Driver

Here’s how you can use Selenium with GeckoDriver to launch Firefox:

Keep in mind that it’s a good practice to put the ‘driver initialization’ and ‘quit’ in the ‘try’ and ‘finally’ blocks. This is to make sure that the driver is closed and resources are freed no matter what happens.

It’s important to note that you need to download the GeckoDriver executable, put it in your machine and specify the path of the executable in the code.

On Windows, this path should use forward slashes ‘/’ or double backslashes ‘\’ instead of single backslashes ”, also need to prefix the path with ‘r’ for example, r’C:\path\to\geckodriver.exe’

How can I use Selenium WebDriver to configure a proxy in Firefox?

You can set a proxy using the FirefoxDriver for Selenium by creating a FirefoxOptions object, setting the proxy information in the object, and then passing the object to the FirefoxDriver constructor.

Here is the code for how you can set a proxy in Firefox using Selenium WebDriver:

Here, “network.proxy.type” is set to 1 to indicate that a proxy should be used. “network.proxy.http” and “network.proxy.http_port” is set to the host and port of the HTTP proxy, and “network.proxy.ssl” and “network.proxy.ssl_port” are set to the host and port of the SSL proxy.

Please make sure to provide the correct host and port of the proxy you would like to use.

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Summing Up

Selenium is great for testing web applications and pages. However, this tool requires technical expertise and programming skills. Besides, it is hard to maintain or modify tests in Selenium; this is where Testsigma comes in.

Testsigma is a no-code test automation tool that can help you write automated tests up to 5 times faster, without the need to learn to code. The platform lets you execute your tests for web applications, mobile applications and APIs. It is much more simpler and intuitive to handle tests and manage test reports with Testsigma. Thus, you can execute your tests on different types of browsers including Firefox. 

Frequently Asked Questions:

Is Firefox or Chrome better for Selenium?

The choice between Firefox and Chrome for Selenium testing can depend on a variety of factors, and ultimately it is up to the individual or team using Selenium to decide which browser is the best fit for their specific needs. In general, Chrome is the most preferred browser (79.9% market share as of October 2022) for all kinds of tasks.

Can a website detect when you are using Selenium with Firefox?

It is possible for a website to detect when you are using the Firefox Driver for Selenium, it automates a real web browser, and the browser’s user agent string will be the same as if a real user were browsing the site.

Website administrators can use browser fingerprinting techniques to detect Selenium by looking at the browser’s characteristics, such as browser version, installed fonts, screen resolution, plugins, and more. Each request sends these characteristics as HTTP headers, so a website can use JavaScript or server-side code to read these headers and detect Selenium automation.

However, this technique is not 100% accurate, as there may be many legitimate reasons why a browser’s characteristics would match those of a Selenium-controlled browser.

Which Firefox version is best for Selenium?

The best version of Firefox to use with Selenium depends on the specific requirements of your project, as well as the versions of Selenium and the Firefox browser you are using.

Selenium supports a wide range of Firefox versions, but the most recent version of Firefox is recommended as it will have the latest features and bug fixes. It’s also important to note that the version of Firefox you are running your tests on should be compatible with the version of Selenium WebDriver you are using. You can check Selenium’s release notes for the version compatibility matrix.

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