illiad wrote::? I see the part "75,687 versions of 16,706 Firefox add-ons" but where do I see WHAT these are?? or have I missed the point??
Did you download and install the extension? It's the .xpi file here:
You'll see it in your Add-ons Manager once you've installed it:
You'll get a toolbar button (see the orange-and-blue one that looks a little like the Fx logo?):
When you click on it, you'll see this:
(click to enlarge)
You can interact with this page just as you would with a page on the World Wide Web.
Click on the appropriate links and you will download and/or install the desired extension.