Selenium: Selenium 3.6.0 WebDriverException: Message: Unable to find a matching set of capabilities

[TarunTater]

Meta -

OS: Mac OS Sierra - 10.12.1
Selenium Version: 3.6.0
Browser: Firefox
Browser Version: 52.4.1 (64-bit)
geckodriver: v0.19.0

When I try a simple code to open a browser in python and hit a page in this :
driver = webdriver.Firefox(executable_path="/Users/tarun/mozDriver")
I get this error :
WebDriverException: Message: Unable to find a matching set of capabilities

Other suggested posts suggest that I should update browser, selenium etc, but I have already updated them and still get the error. I don't get this error on chrome

[javaversion]

Did you try with v56 of Firefox? The same exception was thrown (Selenium Version: 3.6.0 + geckodriver: v0.19.0) in my project and this version solved it.

[TarunTater]

@javaversion - ya, that worked. Thanks

[LakshmanMusulla]

Hey Guys, i am using below code and i am seeing
Message: Unable to find a matching set of capabilities

from selenium import webdriver
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
binary = FirefoxBinary("C:\Program Files (x86)\Mozilla Firefox\firefox.exe")
driver = webdriver.Firefox(executable_path="geckopath",firefox_binary=binary)

[hmchaitra]

Hey,
I am also facing the same issue..can anyone help out..
for what version of firefox what version of geckodriver is required, i mean how can we get the version compatibility.????

[badari412]

@hmchaitra, you can get that info from geckodriver releases page: https://github.com/mozilla/geckodriver/releases

Check the release notes of your geckodriver to know the corresponding version of Firefox.

[hmchaitra]

Thank you..

[javaversion]

Hi @hmchaitra ,

Selenium v3.6.0 (Java) Release explicitly didn't mention any dependency explicitly.

The last dependency explicitly mentioned by Selenium was for v3.4.0 which is as follows :

Geckodriver 0.16 is strongly recommended

GeckoDriver Release Perspective :

GeckoDriver v0.19.0: Firefox 55.0 (and greater) & Selenium 3.5 (and greater)
GeckoDriver v0.18.0: Firefox 53.0 (and greater)
GeckoDriver v0.16.0: Selenium 3.4 (and greater)

Mozilla Firefox Versions :

Ideally, each Selenium release should support each version of Mozilla Firefox releases (starting with Firefox 48.x) where the property "marionette" needs to be set to true.

If you are working with the legacy Firefox releases (till Firefox 47.x) GeckoDriver still works but you have to explicitly set the property "marionette" to false.

Kind regards.

[patelketul]

I am getting same error, too. I am running selenium server 3.6.0 on macOS Sierra using python and I am registering a WINDOWS node and trying to open firefox 59.0.