[Python] Python Selenium - Can't retrieve cookies with driver.get_cookies() in private mode in...

I want to get specific cookies that are only obtainable when in private mode. Chrome cannot be used.

I initially used the following code:

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

options = Options()
options.set_preference("browser.privatebrowsing.autostart", True)
driver = webdriver.Firefox(options=options)

driver.get("https://www.websitewithcookies.com")
print(driver.get_cookies())


But it printed out an empty list. I also tried setting this option.

options.set_preference("privacy.firstparty.isolate", True)


When using this option, the website has the cookies I need but it also prints out an empty list.

I could retrieve the cookies using a Javascript code with driver.execute_script("return document.cookie;"), but it doesn't print every cookie (e.g. cookies that are HttpOnly aren't shown).

I looked at this stack overflow post but it didn't have any answers.

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