Does Selenium Grid 4 for Firefox lack extension addon option? - python-3.x

Question

I have Selenium working well locally, adding extensions with the following setup.
from selenium import webdriver
from selenium.webdriver.firefox.options import Options as firefox_options
def init_firefox(self,threadname,headless,images_off):
if headless == True:
options=firefox_options()
options.add_argument("--headless")
driver = webdriver.Firefox(options=options,executable_path=(r"C:\Users\charl\OneDrive\python\gecko\geckodriver.exe"))
else:
options=firefox_options()
driver = webdriver.Firefox(executable_path=(r"C:\Users\charl\OneDrive\python\gecko\geckodriver.exe"))
extension_dir = ('C:\\Users\\charl\\OneDrive\\python\\gecko\\extensions\\')
extensions = [
'firefox#vid.io.xpi',
'noimages.xpi',
]
for extension in extensions:
driver.install_addon(extension_dir + extension, temporary=True)
self.close_tab(driver)
self.login(driver)
return driver
But when I try the same on Selenium Grid 4 using this code:-
from selenium import webdriver
from selenium.webdriver.firefox.options import Options as firefox_options
def init_firefox_remote(self,threadname,headless,images_off):
if headless == True:
#options = Options()
options=firefox_options()
options.add_argument("--headless")
driver = webdriver.Remote(command_executor='http://xx.xxx.xx.xx:4444/wd/hub', options=options)
else:
options=firefox_options()
driver = webdriver.Remote(command_executor='http://xx.xx.xx.xx:4444/wd/hub', options=options)
extension_dir = ('/dev/shm/extensons/')
extensions = [
'firefox#vid.io.xpi',
'noimages.xpi',
]
for extension in extensions:
driver.install_addon(extension_dir + extension, temporary=True)
self.close_tab(driver)
self.login(driver)
return driver
I get an error:-
AttributeError: 'WebDriver' object has no attribute 'install_addon'
The version of Selenium Grid I am using is created like this
$ docker run -d -p 4444:4444 -v /dev/shm:/dev/shm selenium/standalone-firefox:4.0.0-beta-3-prerelease-20210321
Any ideas? Does Selenium Grid for Firefox lack the install extension option?

Answer 1

Installing addons in a remote Firefox browser is done by creating a Firefox profile and adding the extension there:
from selenium import webdriver
from selenium.webdriver.firefox.options import Options as FirefoxOptions
profile = webdriver.FirefoxProfile()
options = FirefoxOptions()
profile.add_extension("/path/to/extension.xpi")
driver = webdriver.Remote(command_executor="http://xx.xx.xx.xx:4444/wd/hub",
options=options,
browser_profile=profile)
I don't think it is possible to load a temporary addon in a remote firefox browser.

Answer 2

install_addon is only available for local webdrivers. A simple workaround is required when using remote webdrivers, as mentioned in this issue.
More specifically, change this line:
driver.install_addon(extension_dir + extension, temporary=True)
to
webdriver.Firefox.install_addon(driver, extension_dir + extension, temporary=True)
The full code should look like the following:
from selenium import webdriver
from selenium.webdriver.firefox.options import Options as firefox_options
def init_firefox_remote(self,threadname,headless,images_off):
if headless == True:
#options = Options()
options=firefox_options()
options.add_argument("--headless")
driver = webdriver.Remote(command_executor='http://xx.xxx.xx.xx:4444/wd/hub', options=options)
else:
options=firefox_options()
driver = webdriver.Remote(command_executor='http://xx.xx.xx.xx:4444/wd/hub', options=options)
extension_dir = ('/dev/shm/extensons/')
extensions = [
'firefox#vid.io.xpi',
'noimages.xpi',
]
for extension in extensions:
webdriver.Firefox.install_addon(driver, extension_dir + extension, temporary=True)
self.close_tab(driver)
self.login(driver)
return driver
I have opened a pull request to the Selenium Docs to clarify such usages.