Also, why does Chrome on ChromeOS not open PDFs? It's irritating not only because of the downloads folder, but also because it usually makes more sense to have

Also, why does Chrome on ChromeOS not open PDFs? It's irritating not only because of the downloads folder, but also because it usually makes more sense to have a PDF in a tab, rather then its own window. For example, if an HN submission is a PDF, I want to open both the PDF and the comments in new tabs, and have those tabs next to each other.