Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

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
This thread was archived. Please ask a new question if you need help.
Archived

when I quit Firefox I get "ReferenceError: b is not defined". How do I fix this?

Firefox
TonyE replied
broschuck
broschuck

When I quit a box appears with a warning icon that states "ReferenceError: b is not defined". I have it on one computer but not on my other one despite the fact they are identical Mac Book Pro's.

When I quit a box appears with a warning icon that states "ReferenceError: b is not defined". I have it on one computer but not on my other one despite the fact they are identical Mac Book Pro's.

All Replies (1)

TonyE
TonyE

This error is likely to be caused by an add-on not working properly. See troubleshooting extensions and themes for details of how to identify the add-on causing the issue.