Important Notice: We're experiencing email notification issues. If you've posted a question in the community forums recently, please check your profile manually for responses while we're working to fix this.

On Monday the 3rd of March, around 5pm UTC (9am PT) users may experience a brief period of downtime while one of our underlying services is under maintenance.

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

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

How to fix JavaScript App Type error: Components classes'@mozilla.org/extensions/manager;1' is undefined

  • 3 amsoshi
  • 161 sa na da wannan matsala
  • 5 views
  • Amsa ta ƙarshe daga Xircal

more options

Every time FF4.0.1 is opened the error message shows and must nbe closed before the FF screen shows. I've reloaded FF4.0.1 in hopes some code was missing, but no change....the Java Script Application error message still shows?

Every time FF4.0.1 is opened the error message shows and must nbe closed before the FF screen shows. I've reloaded FF4.0.1 in hopes some code was missing, but no change....the Java Script Application error message still shows?

All Replies (3)

more options

Zaɓi Mafita

more options

Following the ideas in the prior FAQ cited, went to the FF Troubleshooting extensions and themes & followed it down through disabling extensions. The Ask toolbar turned out to be the culprit even though in was not on the FF screen.

more options

I noticed you have My Web Search installed which might also cause you problems at some time in the future. I'd avise you to disable that too via Add-ons | Plugins. See http://en.wikipedia.org/wiki/My_web_search

You also need to update Flash via http://get.adobe.com/flashplayer/ Details of the vulnerability in the version you have installed at the moment can be seen here: http://www.adobe.com/support/security/advisories/apsa11-02.html