Remove old java consoles in firefox 8

Do have old java consoles stuck in firefox?

Here is what do to: Win7, firefox 8 <- Working

Close Firefox.
Then Manually remove unwanted extensions by opening the installation directory "extensions" folder and deleting the associated subfolder (e.g., to uninstall the Java Console 6.0.18 extension on 64-bit Windows, open the C:\Program Files (x86)\Mozilla Firefox\extensions\ folder and delete the "{CAFEEFAC-0016-0000-0018-ABCDEFFEDCBA}" subfolder).
Start firefox, and look, gone :)