Where do I put FCP Plugins Again?

I can never remember where to put FCP plugins to install them. . . so I found this handy guide.  

For the original post, click here.

28 MUST-HAVES For FCP Editors!!

"14 Must Have FREE Plugins & Tools for Final Cut Pro" from THEDVSHOW

"The DV Show lists 14 FREE FCP tools. Here’s 14 paid ones as well." From PVC