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

every time I open firefox the following message appears: what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined" . After I press "OK" it continues, apparently normally.

  • 1 jibu
  • 1 ana tatizo hili
  • 1 view
  • Last reply by Hasan

more options

Everytime I open Firefox the following message appears:


what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefine

Everytime I open Firefox the following message appears: what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefine

All Replies (1)

more options

Troubleshooting extensions and themes

Check and tell if its working.