Here is a boilerplate of a Python Selenium web scrapper able to download the HTML source code of any page.

selenium.py

import ssl
from time import sleep

from selenium import webdriver
from selenium.webdriver import firefox

ssl._create_default_https_context = ssl._create_unverified_context

class SeleniumConnector():
    driver = None

    def __call__(self, search:str, wait:int=2) -> str:
        '''
        Gets the html from the website
        '''
        driver = self._get_selenium_driver()
        driver.get(search)
        sleep(wait)
        source = driver.page_source
        return source

    def __new__(cls):
        ''' Defines the class as a singleton, thus preventing multiple browser instances'''
        if not hasattr(cls, 'instance'):
            cls.instance = super(SeleniumConnector, cls).__new__(cls)
        return cls.instance

    def _get_selenium_driver(self) -> webdriver.Firefox:
        if not self.driver:
            options = firefox.options.Options()
            options.add_argument('--headless')
            options.add_argument('javascript.enabled')
            options.add_argument('--no-sandbox')
            self.driver = webdriver.Firefox(service=firefox.service.Service('geckodriver'), options=options)
        return self.driver

if __name__ == '__main__':
    selenium = SeleniumConnector()
    source = selenium('https://www.google.com/')