Currently there are three entries in my Firefox addons list for the Java Console, v6.0.20, v6.0.19, and v6.0.16. The entries for the last two older, superseded entries are greyed out.
In particular, the only button which works is Enable/Disable. The Uninstall button can not be used.
How can I get rid of these out of date Java Console addons? I have disabled them but I would prefer to just get rid of them completely.