DeprecationWarning: firefox_profile has been deprecated, please pass in an Options object

Here is the documentation for this: https://www.selenium.dev/documentation/webdriver/capabilities/driver_specific_capabilities/#setting-a-custom-profile

I tried this locally and it worked:

EDITED: I've changed the code, so there are no deprecation warnings

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

profile_path = r'C:\Users\Administrator\AppData\Roaming\Mozilla\Firefox\Profiles\y1uqp5mi.default'
options=Options()
options.set_preference('profile', profile_path)
service = Service(r'C:\WebDriver\bin\geckodriver.exe')

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

driver.get("https://selenium.dev")

driver.quit()

This error message...

firefox_profile has been deprecated, please pass in an Options object

...implies that FirefoxProfile() have been Deprecated and with selenium4 to use a custom profile you have to use an instance of Options.

This DeprecationWarning was inline with the following CHANGELOGS:

• Selenium 4 beta 1

  • Deprecate all but Options and Service arguments in driver instantiation. (#9125,#9128)

• Selenium 4 beta 2

  • Deprecate using a Firefox profile in Options

• Selenium 4 Beta 3

  • Only give deprecation warning if Profile is being used in options

All the configurations which was earlier set through profile.set_preference() now can be set through options.set_preference() as follows:

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

profile_path = r'C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\s8543x41.default-release'
options=Options()
options.set_preference('profile', profile_path)
options.set_preference('network.proxy.type', 1)
options.set_preference('network.proxy.socks', '127.0.0.1')
options.set_preference('network.proxy.socks_port', 9050)
options.set_preference('network.proxy.socks_remote_dns', False)
service = Service('C:\\BrowserDrivers\\geckodriver.exe')
driver = Firefox(service=service, options=options)
driver.get("https://www.google.com")
driver.quit()

tl; dr

Setting a custom profile