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

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Upon launch of Firefox, get the following error message: Java Script Application, Type Error: Components, Classes [cid] is undefined. How can I resolve this problem?

  • 1 baphendule
  • 7 zinale nkinga
  • 1 view
  • Igcine ukuphendulwa ngu TonyE

Pawpatch
Pawpatch
more options

Upon launching Firefox 4, I get a Java Script Application pop-up window error message. The window notes: Type Error: Components, Classes [cid] is undefined.

Already checked to see if my Java was up to date and it is. Did not have this problem with the previous version of Firefox. How do I resolve this problem?

Upon launching Firefox 4, I get a Java Script Application pop-up window error message. The window notes: Type Error: Components, Classes [cid] is undefined. Already checked to see if my Java was up to date and it is. Did not have this problem with the previous version of Firefox. How do I resolve this problem?

All Replies (1)

TonyE
TonyE
  • Moderator
more options

That indicates that you are using an add-on that is not compatible with Firefox 4. For details of how to troubleshoot this to find out what one is causing the problem see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes