I have this exact problem. Running Catalina and Safari and Chrome on iMac desktop. Evernote web clipper works perfectly on Chrome. It worked perfectly on Safari, until recently when this exact situation occurred. Evernote Web Clipper not listed in the preference extension list, and when I go to Extensions which takes me to App Store, the only choice is "Open". When I do, the Web clipper icon opens on the screen toolbar, and when I click to activate it, nothing happens. Nothing. And so no Web clipper app icon next to the URL address window, and no listing in the extension preference window.
I will add that this was temporally related to apparent malware hijacking my search engine from Google to Yahoo. After running ComboCleaner, the malware was removed, Google search returned as my search engine, but no change to losing Web Clipper. Furthermore, I have a Rakuten Extension that similarly has been lost in a similar fashion on Safari, but not Chrome. I have no other extensions that I know of.
Any thoughts?
