Unable to open browser with url: '' (Root cause: org.openqa.selenium.WebDriverException: newSession

After Firefox updated from v62, the test cases are unable to launch Firefox with error of Unable to open browser with url: ‘’ (Root cause: org.openqa.selenium.WebDriverException: newSession.
New Gecko driver needed if you have firefox 63.0(64-bit).
Error observed with Katalon studio 5.7.0 and 5.8.3.
Current Geckodriver version 19 should be updated to v23 from GitHub - mozilla/geckodriver: WebDriver for Firefox in \configuration\resources\drivers\firefox_win64 directory which would resolve that error.

1 Like

Hi Peter,

I downloaded the Geckodriver v23 and running the .exe file does not do anything? (This is my first time installing this driver). And, where do I find \configuration\resources\drivers\firefox_win64 directory? Appreciate if you could help. Thanks.

Hi Peter,

I just installed Katalon Studio and am having a similar problem with Firefox on Windows 7 with the message:

Unable to open browser with url: ‘’ (Root cause: No driver is set for execution.)

I updated to the Geckodriver v23 but it still gives the same message, any suggestions? Thanks.

Guys, once try out Geckodriver v21.
It is working fine for me.

Here’s the link : https://github.com/mozilla/geckodriver/releases

Jacqueline Lin said:

Hi Peter,

I downloaded the Geckodriver v23 and running the .exe file does not do anything? (This is my first time installing this driver). And, where do I find \configuration\resources\drivers\firefox_win64 directory? Appreciate if you could help. Thanks.

Hi,

Can anyone guide me after running Geckodriver.exe what should I do? Thanks.

Jacqueline Lin said:

Jacqueline Lin said:

Hi Peter,

I downloaded the Geckodriver v23 and running the .exe file does not do anything? (This is my first time installing this driver). And, where do I find \configuration\resources\drivers\firefox_win64 directory? Appreciate if you could help. Thanks.

Hi,

Can anyone guide me after running Geckodriver.exe what should I do? Thanks.

As I mentioned earlier, download the geckodriver.exe v21 from the link.

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

Extract the zip file, copy the geckodriver.exe file and go to your Katalon Studio folder(where you have katalon.exe file), and from there, navigate to

configuration\resources\drivers\firefox_win64 folder.

There you will find an existing geckodriver.exe file. Just delete it, and paste the geckodriver.exe file which you copied previously, As shown in the image.

Screenshot (33).png

1 Like

Vidyasagar Sakaray said:

Jacqueline Lin said:

Jacqueline Lin said:

Hi Peter,

I downloaded the Geckodriver v23 and running the .exe file does not do anything? (This is my first time installing this driver). And, where do I find \configuration\resources\drivers\firefox_win64 directory? Appreciate if you could help. Thanks.

Hi,

Can anyone guide me after running Geckodriver.exe what should I do? Thanks.

As I mentioned earlier, download the geckodriver.exe v21 from the link.

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

Extract the zip file, copy the geckodriver.exe file and go to your Katalon Studio folder(where you have katalon.exe file), and from there, navigate to

configuration\resources\drivers\firefox_win64 folder.

There you will find an existing geckodriver.exe file. Just delete it, and paste the geckodriver.exe file which you copied previously, As shown in the image.

Thanks! I’m able to run the test in Firefox browser now. :slight_smile: