selenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities with Firefox 46 through Selenium
Solution 1
As you are using Selenium 3.8.0 you have to use GeckoDriver as a mandatory. But again as you are using Firefox v46.0 you have to set the capability marionette as False
through DesiredCapabilities()
as follows :
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
cap = DesiredCapabilities().FIREFOX
cap["marionette"] = False
browser = webdriver.Firefox(capabilities=cap, executable_path="C:\\path\\to\\geckodriver.exe")
browser.get('http://google.com/')
browser.quit()
Solution 2
If you're going to use Geckodriver, you definitely need to use a newer version of Firefox. Frex: https://github.com/mozilla/geckodriver/releases/tag/v0.19.0 lists FF55 or greater.
If you plan on using FF46, don't use geckodriver. Update your capabilities to have marionette set to False:
caps = DesiredCapabilities.FIREFOX.copy()
caps['marionette'] = False
driver=webdriver.Firefox(capabilities=caps)
Solution 3
I had this issue on my MacOS 10.5 Catalina.
What I did:
1. Installed the geckodriver using brew install geckodriver
2. Deleted/uninstalled my existing(OLD) Firefox browser (v.46) and installed v70.
3. tried:
from selenium import webdriver
browser = webdriver.Firefox()
browser.get('http://google.com')
The above worked fine with no errors, by launching Firefox and loading google.com
Solution 4
I got this error because the Firefox browser was not installed on my machine. You can download Firefox or download the Chrome driver here. If you use the Chrome drive, make sure you add it to the path (just like the geckodriver).
And the you can use it like this:
from selenium import webdriver
driver = webdriver.Chrome()
driver.get("http://www.python.org")
Comments
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Eamonn Gormley over 3 years
I must have some versions here that don't match up since I can't get Selenium with Python to fire up a Firefox web browser. I'm using an older version of Firefox because other people in here have the same old version of Python and for them the old version of Firefox works best.
Code:
from selenium import webdriver from selenium import common from selenium.webdriver import ActionChains from selenium.webdriver.common.by import By from selenium.webdriver.support.ui import WebDriverWait from selenium.webdriver.support import expected_conditions as EC from selenium.common.exceptions import TimeoutException from selenium.common.exceptions import NoSuchElementException from selenium.webdriver.common.desired_capabilities import DesiredCapabilities driver=webdriver.Firefox(capabilities=DesiredCapabilities.FIREFOX)
Error:
Traceback (most recent call last): File "scrapeCommunitySelenium.py", line 13, in <module> driver=webdriver.Firefox(capabilities=DesiredCapabilities.FIREFOX) File "/Library/Python/2.7/site-packages/selenium/webdriver/firefox/webdriver.py", line 158, in __init__ keep_alive=True) File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 154, in __init__ self.start_session(desired_capabilities, browser_profile) File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 243, in start_session response = self.execute(Command.NEW_SESSION, parameters) File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 311, in execute self.error_handler.check_response(response) File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 237, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities
Version info:
- Python 2.7.10
- Selenium 3.8.0
- Firefox 46.0
- GeckoDriver 0.19.1 (It's in a folder which is in my PATH environment variable)
- MacOS 10.12.6
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Eamonn Gormley over 6 yearsSetting marionette to False seems to do the trick. Thank you!
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akshay dhule almost 6 years' cap["marionette"] = false ' => gives error : 'caps not defined'. What does this line change?
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FilBot3 over 4 yearsI keep getting "The browser appears to have exited before we could reconnect." However, its asking to close the browser each time I run the thing.
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Darsh Patel almost 4 yearsThis solution also works for MacOS, just need to change the executable path.
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Yaakov Bressler over 3 yearsSAME here! Wow, I must've read over 75 webpages before coming across this...