The main reason “your browser” isn’t enough for me is that it doesn’t allow you to add and edit bookmarks, which I use a lot to navigate large pdfs quickly.

Second is that it’s nice to keep your pdf tabs separated from your browser tabs, and a pdf reader can remember your tabs and exactly which page you were on etc.

So that’s why I’m using PDF-Xchange, I downloaded it for free idk why it says purchase.