That worked, but in “X-ing” out of them, it appears I have lost them forever (although they still appear in the extension list, but I cannot re-load them)…
Related question:
How do I get extensions to show up under the Extensions tab ? (Only about 4 of them are available from this tab).
Fredo6, in particular, puts his tools onto the Tools menu as submenus “Fredo Tools” and “Fredo6 Collection” depending on which tools you have installed. He also has toolbars you can set to visible.