Error when adding cookies in selenium. How to fix?

Question

Python

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

opt = Options()
opt.set_headless()
assert opt.headless

browser = Firefox(options=opt)

browser.add_cookie({'name': 'JSESSIONID', 'value': 'session', 'domain': 'mercury.vetrf.ru', 'path': '/hs'})

browser.get('https://mercury.vetrf.ru/hs/operatorui?_action=listVetDocument&_language=ru&pageList=1&all=true&request=true')

print(browser.find_element_by_tag_name('html').text)

Here is the error "selenium.common.exceptions.InvalidCookieDomainException: Message: Document is cookie-averse"
Tried through the chrome driver, also an error with cookies

Answer 1

The same error occurred.
Her treatment is to first open the site for which you need to add cookies and only then add them. After adding, either refresh the page or open a new one and you will be happy =)
Important! Be sure to open exactly the site whose cookies you are going to add, otherwise you will get an error.
I only tested on firefox.