Next time you reboot, it will be loaded. To remove a plug-in, just drag it out of the Contextual Menu Items folder. Next time you reboot, it will not be loaded. A couple of the plug-ins let you configure how they work. You configure these by placing files or aliases in the settings folders.
Place here aliases to folders or disks.
This lets you quickly move, copy, or alias the selected files and folders to these destinations, without having to keep the actual destination folders open on the desktop. Place here aliases to applications. This lets you launch any of these applications from wherever you are, as long as you can click to display the contextual menu. Open With . Place here aliases to applications.