# Error running in Firefox

**URL:** <https://forum.katalon.com/t/error-running-in-firefox/13983>\
**Category:** Bug Report\
**Tags:** bugs-report, katalon-studio\
**Created:** [October 29, 2018, 9:16am UTC](https://forum.katalon.com/t/error-running-in-firefox/13983 "2018-10-29T09:16:57Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![devalex88](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/devalex88/32/336_2.png) [@devalex88](https://forum.katalon.com/u/devalex88)\
**Post date:** [December 13, 2018, 7:06am UTC](https://forum.katalon.com/t/error-running-in-firefox/13983/7 "2018-12-13T07:06:55Z")

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Here is the new link:

> [@\[UPDATED\] Known issue and workaround solution if you use Firefox 63](http://forum.katalon.com/t/updated-known-issue-and-workaround-solution-if-you-use-firefox-63/13947):
>
> Hi all, There is a known issue if you use Firefox 63+ to Record/Spy or for execution. When you select Firefox 63+, the following error dialog will be displayed and hence Firefox can’t be started: [Image: https://s3.amazonaws.com/katalon-forum/editor/qf/pa8hezchaz3k.png] Workaround solution: Replace the current Firefox driver with the latest version (0.23.0) Select and download the appropriate type based on your current OS:[https://github.com/mozilla/geckodriver/releases/tag/v0.23.0](https://github.com/mozilla/geckodriver/releases/tag/v0.23.0) Follow …

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