Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

Have updated to F.F.6 I am still getting this error evertime I use it. Message: [Javascript Application] TypeError: Components.classes[@softage.ru/skype/SkypeFfExtension;1'] is undefined - HELP

  • 4 replies
  • 32 have this problem
  • 6 views
  • Paskiausią atsakymą parašė seanparry

more options

Every time I use F.F. I get this error. TypeError: Components.classes['@softage.ru/skype/SkypeFfExtension;1'] is undefined

Does anyone else get this and or know how to remove it?

Many thanks for your help and support

Every time I use F.F. I get this error. TypeError: Components.classes['@softage.ru/skype/SkypeFfExtension;1'] is undefined Does anyone else get this and or know how to remove it? Many thanks for your help and support

Chosen solution

Remove/Disable Skype extension

Uninstalling Add-ons

Check and tell if its working.

Skaityti atsakymą kartu su kontekstu 👍 2

All Replies (4)

more options

This issue is caused by the Skype extension for Firefox.


Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

Modified by cor-el

more options

As suggested I started FF in Safe Mode and I did not get the error. What can I do now to trace which extension is causing this error?

Also can anyone give me a email address for Skype as I cannot find one. So that I can contact them and ask them, if they have an update to fix the problem

more options

Chosen Solution

Remove/Disable Skype extension

Uninstalling Add-ons

Check and tell if its working.

Modified by Hasan

more options

Yes, I went in and disabled Skype and then powered down the system and I think that this has resolved the problem as when I went back it. I do not know have the error.

Many thanks