Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Als je Windows 10 gebruikt, lees dan dit artikel.

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Upon launch of Firefox, get the following error message: Java Script Application, Type Error: Components, Classes [cid] is undefined. How can I resolve this problem?

Firefox
TonyE beantwoord
Pawpatch
Pawpatch

Upon launching Firefox 4, I get a Java Script Application pop-up window error message. The window notes: Type Error: Components, Classes [cid] is undefined.

Already checked to see if my Java was up to date and it is. Did not have this problem with the previous version of Firefox. How do I resolve this problem?

Upon launching Firefox 4, I get a Java Script Application pop-up window error message. The window notes: Type Error: Components, Classes [cid] is undefined. Already checked to see if my Java was up to date and it is. Did not have this problem with the previous version of Firefox. How do I resolve this problem?

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TonyE
TonyE

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