System.InvalidOperationException: 'Expected browser binary location, but unable to find binary in default location error using Firefox Selenium in C#

Question

I'm trying to use Selenium in C# and I get the following error,

System.InvalidOperationException: '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 (SessionNotCreated)'

what could it be?

Do you have installed Firefox? If yes, is the gecko driver installed? — Christian Müller, Jul 15 '20 at 13:04
Maybe that helps: https://www.guru99.com/gecko-marionette-driver-selenium.html — Christian Müller, Jul 15 '20 at 13:14
i am using this site and its not say about this . https://www.codeproject.com/articles/877519/using-selenium-webdriver-with-tor-csharp-code — Ashkan, Jul 15 '20 at 13:17

score 2 · Answer 1 · answered Jul 15 '20 at 22:10

This error message...

System.InvalidOperationException: '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 (SessionNotCreated)'

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

Possibly firefox browser is installed at a non-conventional location, hence GeckoDriver is unable to access the firefox binary.

Solution

As a solution pass the absolute location of the firefox.exe binary through the BrowserExecutableLocation argument of FirefoxOptions as follows:

FirefoxOptions options = new FirefoxOptions();
options.BrowserExecutableLocation = ("C:\\Program Files\\Mozilla Firefox\\firefox.exe"); //location where Firefox is installed
WebDriver driver = new FirefoxDriver(options);

score 1 · Answer 2 · answered Jul 15 '20 at 13:22

1

You need download Mozilla Firefox

https://www.mozilla.org/en-US/firefox/new/

then install Mozilla Firefox.

answered Jul 15 '20 at 13:22

Vy Do

46,709
59
215
313

i download selenium firefox , i want open tor with selenium – Ashkan Jul 15 '20 at 13:27
Did you install Firefox in default location? – Vy Do Jul 15 '20 at 13:29
i have tor browser in my desktop. yes i have firefox – Ashkan Jul 15 '20 at 13:33
https://www.codeproject.com/articles/877519/using-selenium-webdriver-with-tor-csharp-code – Ashkan Jul 15 '20 at 13:33

System.InvalidOperationException: 'Expected browser binary location, but unable to find binary in default location error using Firefox Selenium in C#

2 Answers2

Solution