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

Le thread ibilondoloziwe. Nceda ubuze umbuzo omtsha ukuba ufuna uncedo.

Just updated firefox, every time I open it I get a message about a java script application

  • 4 iimpendulo
  • 6 inale ngxaki
  • 17 views
  • Impendulo yokugqibela ngu chloe_am

chloe_am
chloe_am
more options

The message says

[Java Script Application] can't create mcaffee plug-in object. TypeError: Components.classes[cid] is undefined

The message says [Java Script Application] can't create mcaffee plug-in object. TypeError: Components.classes[cid] is undefined

All Replies (4)

DanHerlihy74
DanHerlihy74
more options

I have the same problem running in Windows 7 when I launch Firefox 4. The slightly different message I get is - [Java Script Application] TypeError: Components.classes[c] is undefined

DanHerlihy74
DanHerlihy74
more options

Correction - the message I get is - TypeError: Components.classes[c] is undefined

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

For chloe_am it indicates the version of McAfee add-on is not compatible.

Ilungisiwe ngu TonyE

chloe_am
chloe_am Umnini wombuzo
more options

Thanks! I just disabled the add on and the message hasn't returned.