how do I acces whatsapp web with selenium in python?

So I am using geckodriver.exe (for Firefox), and I use the following code to acces whatsapp web:

from selenium import webdriver
browser = None
def init():
    browser = webdriver.Firefox(executable_path=r"C:/Users/Pascal/Desktop/geckodriver.exe")
    browser.get("https://web.whatsapp.com/")
init()

But everytime I rerun the code, the QR-Code from whatsappweb has to be scanned again and I dont want that. In my normal chrome browser I dont have to scan the QR-Code everytime. How can I fix this ?