This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

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

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

Hawaiiham
Hawaiiham
more options

Java Script Application X

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

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

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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).