[Python] Firefox handled by Selenium but keep instance running on script termination to...

I'm using Selenium to handle the independent browser usage for Firefox from downloading (~/.cache/firefox) to starting and controlling it, but if my python script is terminated, the running Firefox instance is too.

Because I use the script again and again, I need something like: Start Firefox in --marionette mode with debugging port open, if not already a running instance is detected. Like, the first run of the python script would start that Firefox instance handled by selenium (because Firefox isn't installed by default on systems who are running the script). But later reruns of the script would just connect to the already running instance.

How can this be done with Selenium handling the driver and not by simply starting a popen subprocess?

Currently, this is how I'm using Firefox by Selenium in my script:

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

from selenium.webdriver import Keys, ActionChains
from selenium.webdriver.common.actions.action_builder import ActionBuilder
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

class Browser:
firefox_options = Options()
firefox_options.add_argument("-profile")
firefox_options.add_argument("C:/firefox/profile/")
driver = None

wait = None
EC = EC
By = By
Keys = Keys
ActionChains = ActionChains
ActionBuilder = ActionBuilder

def __init__(self):
try:
self.driver = webdriver.Firefox(options=self.firefox_options)
self.wait = WebDriverWait(self.driver, timeout=15, poll_frequency=.2)
except:
raise ValueError("Firefox not running?")

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