When a PDF file is open and viewable in a window or tab, press CTRL + S to save the PDF file. Or you can right-cilck somewhere on the page and then click save as.
I was doing some online research the other day and PDF files kept opening in a new window when I was using Google Chrome. The problem is I wanted to download the PDF files instead of viewing them within the browser. There are no menus in Google Chrome that look similar to Internet Explorer or Firefox, so I thought I’d treat it like a Word document or text file. I clicked CTRL + S and was prompted where to save the PDF file. I found that you can also right click on the window and choose ‘save as’ which works great if the PDF is open in a framed window. Now it all makes sense! I can view the PDF right away and simply save the ones I actually need.