I have installed Python 3.6.2, Selenium 3.5.0 with GeckoDriver 0.18.0 and the firefox version is 54.0.1version on windows 7. I am trying to run a selenium script which is loading a firefox where i get mismatch with firefox version error. Please let me know what is the issue. The code and error message below.

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
capabilities = webdriver.DesiredCapabilities().FIREFOX
capabilities["marionette"] = False
binary = FirefoxBinary('C:/Users/gopalakrishnarr/Downloads/FirefoxPortable/App/Firefox/firefox.exe')
driver = webdriver.Firefox(firefox_binary=binary, capabilities=capabilities, executable_path="C:/Users/gopalakrishnarr/AppData/Local/Programs/geckodriver-v0.18.0-win64/geckodriver.exe")
driver.get("http://www.google.com")

Error message returned:

Traceback (most recent call last):File "C:\PythonSelenium\Sample.py", line 12, in <module>driver = webdriver.Firefox(firefox_binary=binary, capabilities=capabilities, executable_path="C:/Users/gopalakrishnarr/AppData/Local/Programs/geckodriver-v0.18.0-win64/geckodriver.exe")File "C:\Users\gopalakrishnarr\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium-3.5.0-py3.6.egg\selenium\webdriver\firefox\webdriver.py", line 171, in __init__self.binary, timeout)File "C:\Users\gopalakrishnarr\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium-3.5.0-py3.6.egg\selenium\webdriver\firefox\extension_connection.py", line 52, in __init__self.binary.launch_browser(self.profile, timeout=timeout)File "C:\Users\gopalakrishnarr\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium-3.5.0-py3.6.egg\selenium\webdriver\firefox\firefox_binary.py", line 73, in launch_browserself._wait_until_connectable(timeout=timeout)File "C:\Users\gopalakrishnarr\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium-3.5.0-py3.6.egg\selenium\webdriver\firefox\firefox_binary.py", line 114, in _wait_until_connectable% (self.profile.path))selenium.common.exceptions.WebDriverException: Message: Can't load the profile. Possible firefox version mismatch. You must use GeckoDriver instead for Firefox 48+. Profile Dir: C:\Users\GOPALA~1\AppData\Local\Temp\tmpc1dfsd6w If you specified a log_file in the FirefoxBinary constructor, check it for details.

When you work with Python 3.6.2, Selenium 3.5.0 with GeckoDriver 0.18.0 and the Firefox browser version is 54.0.1 on Windows 7, you can't set the property marionette to False. Forcefully setting marionette to False will raise an WebDriverException. So either you have to accept the default setting of ["marionette"] = True or you can explicitly set ["marionette"] to True as follows:

from selenium import webdriver
from selenium.webdriver.firefox.firefox_binary import FirefoxBinarycapabilities = webdriver.DesiredCapabilities().FIREFOX
capabilities["marionette"] = True
binary = FirefoxBinary('C:/Program Files/Mozilla Firefox/firefox.exe')
driver = webdriver.Firefox(firefox_binary=binary, capabilities=capabilities, executable_path="C:/Utility/BrowserDrivers/geckodriver.exe")
driver.get("http://www.google.com")