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.

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

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Error Message

  • 2 fhreagra
  • 10 leis an bhfadhb seo
  • 2 views
  • Freagra is déanaí ó garryoman

more options

After installing FF4 I get the following message:

Type Error Components.classes [cid] is undefined.

Help please

After installing FF4 I get the following message: Type Error Components.classes [cid] is undefined. Help please

Réiteach roghnaithe

This is an indication that you have an add-on that is not compatible with Firefox 4. For details of how to troubleshoot that see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Read this answer in context 👍 1

All Replies (2)

more options

Réiteach Roghnaithe

This is an indication that you have an add-on that is not compatible with Firefox 4. For details of how to troubleshoot that see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

more options

Thank you for the rapid response