How to hide Firefox window (Selenium WebDriver)?

Just add the following code.

import os
os.environ['MOZ_HEADLESS'] = '1'
driver = webdriver.Firefox()

Python

The easiest way to hide the browser is to install PhantomJS. Then, change this line:

driver = webdriver.Firefox()

to:

driver = webdriver.PhantomJS()

The rest of your code won't need to be changed and no browser will open. For debugging purposes, use driver.save_screenshot('screen.png') at different steps of your code or just switch to the Firefox webdriver again.

On Windows, you will have to specify the path to phantomjs.exe:

driver = webdriver.PhantomJS('C:\phantomjs-1.9.7-windows\phantomjs.exe')

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Java

Have a look at Ghost Driver: How to run ghostdriver with Selenium using java

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C#

How to hide FirefoxDriver (using Selenium) without findElement function error in PhantomDriver(headless browser)?