setup_tor_headed.py

# import from selenium
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary

binary = '/Applications/Tor Browser.app/Contents/MacOS/firefox'
# the location of 
if os.path.exists(binary) is False:
    raise ValueError("The binary path to Tor firefox does not exist.")
firefox_binary = FirefoxBinary(binary)

browser = None
def get_browser(binary=None,options=None):
    global browser  
    # only one instance of a browser opens, remove global for multiple instances
    if not browser: 
        browser = webdriver.Firefox(firefox_binary=binary,options=options)
    return browser

browser = get_browser(binary=firefox_binary)