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

Question:

from selenium import webdriver;
browser= webdriver.Firefox();
browser.get('http://www.seleniumhq.org');

When I try to run this code, it gives me an 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.

Any thoughts-highly appreciated!

Asked By: Sergii Sechka

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Source

Answers:

You need to download geckodriver.

https://github.com/mozilla/geckodriver/releases

from selenium import webdriver;

browser= webdriver.Firefox('./geckodriver');
browser.get('http://www.seleniumhq.org');
Answered By: dudulu

You should download appropriate web driver from https://github.com/mozilla/geckodriver/releases and put it into folder where your py file is. Also you can put it anywhere as long as the location of the file it is in your system path.

Answered By: Milan Paskaš

Selenium uses a web driver (a specific one for each web browser) in order to communicate with the browser installed on your system (Firefox in your case).

To use Firefox, you have to:

  1. Download its web driver from
    https://github.com/mozilla/geckodriver/releases
  2. Put the web driver in a specific location in the file system (same folder as the python script for example)
  3. Add the web driver location path when initializing in the python code.

So the final code would look like this:

from selenium import webdriver

browser = webdriver.Firefox('./geckodriver')

browser.get('https://www.python.org/')

Note: Sometimes a newer version of the web driver isn’t compatible with an older version of the browser installed on your system.

Answered By: Ali Rida

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 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 FilesMozilla Firefoxfirefox.exe'
driver = webdriver.Firefox(executable_path=r'C:WebDriversgeckodriver.exe', options=options)
driver.get('http://google.com/')

References

You can find a couple of relevant detailed discussion in:

Answered By: undetected Selenium

I have uninstalled firefox and installed it again which resolved my issue.

Answered By: karthik

Firefox was not installed on my system at all. That’s why this error came up.

Answered By: IceRevenge

same issue here:

  • Environment
    • OS: Mac
      • Not install Firefox application
      • has installed geckodriver, can found in PATH
  • Error Reason: Not installed Firefox
  • Solution: (goto firefox official site to download and) install Firefox
Answered By: crifan

Before this ensure that path variable has include for geckodriver click here to download driver and run below python script.

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

options = Options()
options.binary_location = r'C:Program FilesMozilla Firefoxfirefox.exe'
driver = webdriver.Firefox(options=options)
driver.get('http://google.com/')
Answered By: Newton Sathyavety

I have encountered the same problem (Windows, Firefox v99, Selenium 4.1.4, geckodriver 0.31.0), the path to exe file and the driver initialisation were set correctly, solved the issue by changing the win32 by win64 version of geckodriver

Answered By: Shessuky

as a side note for selenium/firefox (but with C#, not Python), this issue is quite relevant now in the sense that firefox location looks to be stored in windows in a new regedit location. Indeed geckodriver is looking in regedit location documented here:

HKEY_LOCAL_MACHINESOFTWARE WOW6432NodeMozillaMozilla Firefox[VERSION]MainPathToExe


HKEY_LOCAL_MACHINESOFTWAREMozillaMozilla Firefox[VERSION]MainPathToExe

Source:
https://developer.mozilla.org/en-US/docs/Web/WebDriver/Capabilities/firefoxOptions

when on my machine it is there:

HKEY_LOCAL_MACHINESOFTWAREMozillaMozilla Firefox 109.0bin

With the version number stored here:

HKEY_LOCAL_MACHINESOFTWAREmozilla.orgMozilla

and I set the selenium driver with C# Api with (path hardcoded for the poc):

var options = new FirefoxOptions();
...
options.BrowserExecutableLocation = @"C:Program FilesMozilla Firefoxfirefox.exe";
Driver = new FirefoxDriver(options);

Regards

Answered By: Thierry Brémard