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When I click on Firefox I get a pop-up that says: Java Script Application TypeError:Components.Classics[cid] is undefined. IS THIS DANGEROUS?

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Hawaiiham
Hawaiiham
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Java Script Application X

! Type Error:Components.classics[cid] is undefined 

                                     OK
Java Script Application X ! Type Error:Components.classics[cid] is undefined OK

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cor-el
cor-el
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This issue can be caused by an extension that isn't working properly.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).