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

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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.

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/')

References

You can find a couple of relevant detailed discussion in:

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