4chan Plus (formerly Zoomify 4chan) 1.18

4chan Plus was created as a handy and accessible Safari extension that allows you to easily zoom on 4chan pictures and images. This happens every time you hover the mouse cursor over the image you want to view.

In addition, when hovering over quotes, you will be able to view the referred post. You can also use it to enable a quickreply box on the 4chan boards.