Expected Browser Binary Location, But Unable to Find Binary in Default Location, No 'Moz:Firefoxoptions.Binary' Capability Provided Using Geckodriver

Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided using GeckoDriver

This error message...

Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided, and no binary flag set on the command line.

...implies that the GeckoDriver was unable to find the Firefox binary at the default location. Additionally you haven't passed the moz:firefoxOptions.binary capability.

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Solution

Possibly within your system firefox is installed in a custom location and these cases you need to pass the absolute path of the Firefox binary through the moz:firefoxOptions.binary capability as follows:

from selenium import webdriver
from selenium.webdriver.firefox.options import Options

options = Options()
options.binary_location = r'C:\Program Files\Mozilla Firefox\firefox.exe'
driver = webdriver.Firefox(executable_path=r'C:\WebDrivers\geckodriver.exe', options=options)
driver.get('http://google.com/')

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References

You can find a couple of relevant detailed discussion in:

• SessionNotCreatedException: Message: Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary'
• InvalidArgumentException: Message: binary is not a Firefox executable error using GeckoDriver Firefox Selenium and Python
• Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided

Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided

This error message...

selenium.common.exceptions.SessionNotCreatedException: Message: Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided, and no binary flag set on the command line

...implies that the GeckoDriver was unable to locate the firefox executable while trying to initiate/spawn a new Browsing Context i.e. Firefox Browser session.

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Reason

The two primary reasons for this error are as follows:

• Firefox isn't installed within your system.
• Firefox isn't installed at the default location within your system.

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Solution

The possible solutions are:

• If Firefox isn't installed in your system, you need to install it before executing your tests.

• If Firefox is installed at a customized location, you need to pass the absolute path of the firefox binary as follows through an Options() instance:

  from selenium import webdriver
  
  options = webdriver.FirefoxOptions()
  options.binary_location = r"C:/location/to/Firefox/Binary/firefox.exe"
  driver = webdriver.Firefox(executable_path=r'C:\Users\Cody\Downloads\geckodriver.exe', options=options)
  driver.get('http://inventwithpython.com/')
  

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References

You can find a couple of relevant detailed discussion in:

• SessionNotCreatedException: Message: Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary'
• InvalidArgumentException: Message: binary is not a Firefox executable error using GeckoDriver Firefox Selenium and Python
• Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided using GeckoDriver

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