Extensions and the problems thereof

Extensions
1

Hi,

OSX El Capitan - 10.11.6
I currently have the following extensions installed, all from the Extension Warehouse, all but one showing enabled in “My Extensions” but I cannot find any of them on SU under Tools or Extensions. Would someone please explain to me why and where do I find them? Thank you. PS - Onion dome was there before I upgraded to 2016 and now no more.

  1. Libfredo6 - (Required as per the literature for some of the others) Curviloft already installed and showing up under Extensions._
  2. Onion Dome
  3. Path Copy
  4. Rotate 90
  5. FredoScale - showing as uninstalled, but selecting open appears to do nothing.