Starting with version 3.2, FFX supports two new extension mechanisms: mission and startup plugins.
Mission plugins allow to add small functionalities or optional behaviours to an FFX 3.2-compatible mod, for example making firehydrants more interactive or letting AI characters use the Limited Jumping attribute.
Startup plugins apply to every FFvsTTR mod and offer some new "hooks" for enterprising modders/tweakers.
Don't like a plugin? Just remove its folder.