Here’s a quick tip: Safari 7.0 in OS X Mavericks can preview Adobe Photoshop ( .psd file ). To do preview a .psd file in Safari, you can either open it from a link and it will show up just like a .pdf file for example ( see below ), or just drag-an-drop the file onto Safari ( see above ).
Of course Preview in OS X can also preview .psd file, but because Safari can do it now, you won’t need to download the files to preview them. NOTE: Safari can also open .eps files ( no idea if it could do that before ), and apparently it can open Adobe Illustrator ( .ai file ) too, but don’t take my word on that. Try a few files to see if it work or not…