It's no way near the Thumbnail Zoom plus. Don't know why the Firefox is suggesting this as replacement when it can't even do the one job it's supposed to do...It just shows the thumbnail without enlarging it, without enhancing the quality, which makes it annoying and makes the user remove it !

This so called 'Quantum' or Firefox57 has been sucking so far. It took away one of my favorite add-on. I realized how much I've adapted and got used to to Thumbnail zoom plus after they removed it. That extension has become of part of daily browsing but now it's no more. Not just this, they completely changed the interface of browser and filled with useless stuff that are good for nothing.

More ways to push users towards Chrome or other browsers if you ask me.