Yes, you are missing something.  ;-)) Show the add-on you're looking for. I have no issue getting to the page for Ghostery. see screenshot

If the extension has an homepage listed on "Add-ons" (Ctrl+Shift+A), then you can visit its homepage where you usually can find a link or button to go to its page on the Add-ons website.

You can use the "reviews" link at the bottom to get to the AMO listing.

mine is different on windows i dont have the author underneath i can click on

Interesting... Let me install it and see what I get.

Look what I found. https://www.youtube.com/watch?v=Ix725jppF_4 https://www.mrfdev.com/enhancer-for-youtube

It's not official. That should answer your question about the mystery add-on. Will there be anything else???  ;-)

ah perfect mystery solved then :)

thanks for your time

No problem. Mark this issue as resolved and have a nice day.