Here is my code:

profile = webdriver.FirefoxProfile('C:\\Users\\Administrator\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\kvycjolb.Prdel')
driver = webdriver.Firefox(profile)

Im not getting any error and firefox starts, but it just does not load with this profile: I have tried changing / to // etc.. but no luck.

This also does not work:

from selenium import webdriver
from selenium.webdriver.firefox.firefox_profile import FirefoxProfile
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
binary = FirefoxBinary("C:\\Program Files\\Mozilla Firefox\\firefox.exe")
profile = FirefoxProfile("C:\\Users\\Administrator\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\kvycjolb.Prdel")
driver = webdriver.Firefox(firefox_profile=profile, firefox_binary=binary, executable_path="C:\\aprog\\geckodriver.exe")
driver.get('https://google.com')

Im getting error:

C:\aprog>testff
Traceback (most recent call last):File "C:\aprog\testff.py", line 7, in <module>driver = webdriver.Firefox(firefox_profile=profile, firefox_binary=binary, e
xecutable_path="C:\\aprog\\geckodriver.exe")File "C:\Python27\lib\site-packages\selenium\webdriver\firefox\webdriver.py",
line 152, in __init__keep_alive=True)File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", l
ine 98, in __init__self.start_session(desired_capabilities, browser_profile)File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", l
ine 188, in start_sessionresponse = self.execute(Command.NEW_SESSION, parameters)File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", l
ine 256, in executeself.error_handler.check_response(response)File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py"
, line 194, in check_responseraise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Unable to find a matchin
g set of capabilities

I think the official answer is found in documentation.

Presently that is:

# Custom profile folder to keep the minidump files
profile = tempfile.mkdtemp(".selenium")
print("*** Using profile: {}".format(profile))# Use the above folder as custom profile
opts = Options()
opts.add_argument("-profile")
opts.add_argument(profile)
opts.binary = "/Applications/Firefox.app/Contents/MacOS/firefox"driver = webdriver.Firefox(options=opts,# hard-code the Marionette port so geckodriver can connectservice_args=["--marionette-port", "2828"])