Firefox configuration in Selenium Python - Test Execution Trace

Test Overview

This test opens Firefox with a custom configuration to disable notifications and verifies the browser launches correctly with the set preferences.

Test Code - unittest

Selenium Python

from selenium import webdriver
from selenium.webdriver.firefox.options import Options
from selenium.webdriver.firefox.service import Service
from selenium.webdriver.common.by import By
import unittest

class TestFirefoxConfig(unittest.TestCase):
    def setUp(self):
        options = Options()
        options.set_preference("dom.webnotifications.enabled", False)
        self.driver = webdriver.Firefox(options=options)

    def test_firefox_launch_with_config(self):
        self.driver.get("https://www.example.com")
        element = self.driver.find_element(By.TAG_NAME, "h1")
        self.assertEqual(element.text, "Example Domain")

    def tearDown(self):
        self.driver.quit()

if __name__ == "__main__":
    unittest.main()

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Firefox options are set to disable notifications	Firefox options object created with 'dom.webnotifications.enabled' set to False	-	PASS
2	Firefox browser is launched with the configured options	Firefox browser window opens without notification prompts	-	PASS
3	Browser navigates to 'https://www.example.com'	Example Domain page is loaded and visible	-	PASS
4	Find the <h1> element on the page	<h1> element with text 'Example Domain' is present	Check that the <h1> text equals 'Example Domain'	PASS
5	Close the browser and end the test	Firefox browser window closes	-	PASS

Failure Scenario

Failing Condition: Firefox browser fails to launch with the specified options or element not found

Execution Trace Quiz - 3 Questions

What does the test configure Firefox to do before launching?

A Disable web notifications

B Enable pop-up windows

C Set browser to private mode

D Change the homepage to example.com

Key Result

Always configure browser preferences explicitly in tests to avoid unexpected pop-ups or notifications that can interfere with automation.