While Feedly is a good service, this "extension" is not. There are other Feedly oriented extensions that actually *do* something. One of which, "Add to Feedly Plus," that I've rated at four stars.
"Feedly - Beyond Google Reader" is just an icon that does the same thing as a bookmark. It adds no function. It alters no function. It "extends" nothing.
(The excessive number of positive reviews for a non-extension is mightly suspicious.)