Can't find this path...

I'm trying to get to plug-in file, and I don't see "Plug-ins" in the Library. ("GO" menu + OPT key)

/Library/Plug-Ins/FxPlug/Separator.fxplug

I need to delete a pesky plug-in that is causing me startup problems. Other people have had the same problem. And the solution was to follow that path (above) to get to the offensive plug-in. But I don't see it.

(And, no, it's not in the usual "movies" folder where most of the plug-ins live. For some reason, this 3rd-party developer has users install the plug-in in an unconventional way.)

This, by the way, is what I'm trying to uninstall: A plug-in called "Separator." And other FCP users have also had a hard time tracking down this critter.