Created attachment 156996 [details] pdf.js thumbnails in firefox The completely black border look outdated. More modern designs don't have such harsh borders, e.g. pdf.js in firefox or Preview for macos. I've attached a screenshot of Firefox's for comparison. It might also be nice to have an option to remove page numbers from appearing above thumbnails since they take up a lot of vertical space. Maybe hovering over a thumbnail could show the page number.