Sometimes there are @Extensions which are part of a plugin that we simply don't want to run but due to limitations with the plugin / plugin configuration / etc we have no way of "disabling". The MavenFingerprinter extension (see JENKINS-12938) is the specific use case.

It would be handy to be able to "blacklist" an @Extension either as a System property or from Manage Jenkins > Manage Plugins.

The alternative is removing the @Extension from the bytecode in .hpi archives, which isn't nearly as fun on a production server as you'd think it would be.