# Cannot open url in firefox

**URL:** <https://forum.katalon.com/t/cannot-open-url-in-firefox/13981>\
**Category:** Miscellaneous\
**Created:** [October 29, 2018, 8:30am UTC](https://forum.katalon.com/t/cannot-open-url-in-firefox/13981 "2018-10-29T08:30:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dalia.tamkeviciute](https://avatars.discourse-cdn.com/v4/letter/d/2acd7d/32.png) [@dalia.tamkeviciute](https://forum.katalon.com/u/dalia.tamkeviciute)\
**Post date:** [October 29, 2018, 8:30am UTC](https://forum.katalon.com/t/cannot-open-url-in-firefox/13981/1 "2018-10-29T08:30:34Z")

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Hello,

I am trying to open a Firefox browser, but every time I receive the below error, could you please help me to resolve the issue?

I have tried to change preferences → web browser, nothing helped.  
I have up to date Katalon, gecko web driver, Firefox browser.

ERROR:

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

Build info: version: ‘3.7.1’, revision: ‘8a0099a’, time: ‘2017-11-06T21:07:36.161Z’

System info: host: ‘LAPTOP-EVJA315R’, ip: ‘192.168.42.93’, os.name: ‘Windows 10’, os.arch: ‘amd64’, os.version: ‘10.0’, java.version: ‘1.8.0\_102’

Driver info: driver.version: CGeckoDriver

remote stacktrace: stack backtrace:

0: 0x4821c4 -

1: 0x482933 -

2: 0x445159 -

3: 0x44eff6 -

4: 0x4322e1 -

5: 0x40ba4e -

6: 0x4119b9 -

7: 0x6d2c89 -

8: 0x426006 -

9: 0x6cd490 -

10: 0x7fff6f3f3034 - BaseThreadInitThunk)

---

<div class="post-metadata">

**Author:** ![Andrej\_Podhajsky](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/andrej_podhajsky/32/1055_2.png) [@Andrej\_Podhajsky](https://forum.katalon.com/u/Andrej_Podhajsky)\
**Post date:** [October 29, 2018, 8:33am UTC](https://forum.katalon.com/t/cannot-open-url-in-firefox/13981/2 "2018-10-29T08:33:26Z")

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did you even try to look for your answer?

> **[\[UPDATED\] Known issue and workaround solution if you use Firefox 63.](http://forum.katalon.com/discussion/10389/known-issue-and-workaround-solution-if-you-use-firefox-63#latest)**
>
> Hi all, There is a known issue if you use Firefox 63+ to Record/Spy or for execution.