python

from selenium.webdriver import Firefox
driver = Firefox()
driver.get('http://example.com')

した時に、

Can't load the profile. というエラーが出る対応。mac。

Firefox 47 から入ってるマリオネット marionette という環境構成システム(?) に、Selenium が対応できていない?

geckodriver を brew でインストールする。

command

$ brew install geckodriver
$ pip install -U selenium

python

firefox_capabilities = DesiredCapabilities.FIREFOX
firefox_capabilities['marionette'] = True

driver = webdriver.Firefox(capabilities=firefox_capabilities)
driver.get('http://example.com')

これでOK

参考: Can't open browser with Selenium after Firefox update - Stack Overflow

追記

その後、

selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH. 

Exception AttributeError: "'Service' object has no attribute 'process'" in <bound method Service.__del__ of <selenium.webdriver.firefox.service.Service object at 0x109a96690>> ignored

これが出たら

python

import os
if "/usr/local/bin" not in os.environ['PATH']:
    os.environ['PATH'] += os.pathsep + "/usr/local/bin"