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

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broschuck
broschuck
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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.

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TonyE
TonyE
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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.