The Sidebar on the extension is what makes the Extension tick. Before we had the extension try and find the DOI and put the buttons next to the title. This caused lots of confusion and different publishers had different layouts. The Sidebar is the answer and makes adding papers to your library quick and easy no matter what website you are on. You also will get a preview for the first page of the PDF so you can make sure the page you are on is the PDF you want! The View PDF and Add to library buttons will operate in the same way as they did before!