Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

'FB is not defined error' in Firefox when trying to login in incognito mode

  • 1 reply
  • 1 has this problem
  • Last reply by cor-el

more options

in my application we have a login to FB button. when user clicks on it is giving 'FB is not defined error' in incognito mode. when i turn off tracking protection for incognito browser it is working fine

All Replies (1)

more options

This is likely caused by blocking third-party social media trackers via Tracking Protection. If you have Tracking Protection enabled in all windows then you will have this issue in normal windows as well.

You can check in the Web Console what content Tracking Protection is blocking.

  • "3-bar" menu button or Tools -> Web Developer