We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

There is error message when start Firefox 4.0.1 as follow: "what happened: TypeError; Components.classes['@mozzilla.org/extensions/manager;1'] is undefined"

  • 1 antwoord
  • 2 hierdie probleem
  • 4 views
  • Laaste antwoord deur TonyE

more options

There is error message when start Firefox 4.0.1 as follow: "what happened: TypeError; Components.classes['@mozzilla.org/extensions/manager;1'] is undefined"

There is error message when start Firefox 4.0.1 as follow: "what happened: TypeError; Components.classes['@mozzilla.org/extensions/manager;1'] is undefined"

All Replies (1)

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