Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

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.

Rohkem teavet

Everytime I open Firefox I get this message: what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined

  • 1 vastus
  • 6 on selline probleem
  • 1 view
  • Viimati vastas TonyE

more options

Every time I open Firefox I get the following message window: what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined

I click on OK and then Firefox opens.

Every time I open Firefox I get the following message window: what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined I click on OK and then Firefox opens.

All Replies (1)

more options

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