After recently upgrading Firefox I noticed several old versions of the Java Console under the Add-ons section. I could see the versions but could not uninstall them because the button was disabled. Uninstalling Java removed the most current version but not the old versions. After some digging I found that Firefox 3.6 started showing disabled add-ons. I was able to remove the old add-ons by going to c:\program files\Mozilla Firefox\extensions and removing the folders starting with “{CCAFE”.
While looking into this I found an free tool for automating the procedure to remove old versions of Java - http://raproducts.org/javara.html