Python: How to add Firefox extensions in Selenium 4

Question

The last version I used of Selenium was 3.141.0.

I am now transitioning to Selenium 4, and I am trying to figure out how to add extensions for Firefox, in Python 3.

Previously, something like this would work:

from selenium import webdriver

profile = webdriver.FirefoxProfile(profile_path)
profile.add_extension('adblock_plus-3.10.2-an+fx.xpi')
driver = webdriver.Firefox(profile)

While attempting to make some adjustments that are apparently needed for Selenium 4, I tried the following code:

from selenium import webdriver
from selenium.webdriver.firefox.service import Service
from selenium.webdriver.firefox.options import Options

options = Options()
options.set_preference('profile', profile_path)
options.add_extension('adblock_plus-3.10.2-an+fx.xpi')

service = Service('/usr/local/bin/geckodriver')

driver = webdriver.Firefox(options=options, service=service)

In Selenium 4.1.0, this gives AttributeError:

options.add_extension('adblock_plus-3.10.2-an+fx.xpi')
AttributeError: 'Options' object has no attribute 'add_extension'

Using .add_extension() with an Options() object is apparently not the correct way to add an extension. However, I am unable to find the right way.

It is potentially possible to create a FirefoxProfile and add the extension there, but at very least that seems to give a DeprecationWarning, and I don't know if it will work anyhow:

from selenium import webdriver
from selenium.webdriver.firefox.service import Service
from selenium.webdriver.firefox.options import Options

profile = webdriver.FirefoxProfile(profile_path)
profile.add_extension('adblock_plus-3.10.2-an+fx.xpi')

options = Options()
options.set_preference('profile', profile_path)

service = Service('/usr/local/bin/geckodriver')

driver = webdriver.Firefox(profile, options=options, service=service)

DeprecationWarning: profile has been deprecated, please pass in an Options object
  driver = webdriver.Firefox(profile, options=options, service=service)

What is the proper way to add extensions in Selenium 4 for Firefox?

Answer 1

You should be able to add an extension directly on the Webdriver

driver = webdriver.Firefox(service=service)
driver.install_addon('adblock_plus-3.10.2-an+fx.xpi')

https://www.selenium.dev/selenium/docs/api/py/webdriver_firefox/selenium.webdriver.firefox.webdriver.html#selenium.webdriver.firefox.webdriver.WebDriver.install_addon