As Alan mentioned - you can wait for some element to be loaded. Below is an example code
from selenium import webdriver from selenium.webdriver.support.wait import WebDriverWait from selenium.webdriver.common.by import By from selenium.webdriver.support import expected_conditions as EC browser = webdriver.Firefox() element = WebDriverWait(browser, 10).until(EC.presence_of_element_located((By.ID, "element_id")))