My Firefox and Chrome usually open PDF files very nicely, without asking and within the browser window.
When clicking on a link to a PDF on our own website:
- Firefox asks if it should download them, to see it I need to open the download history.
- Chrome downloads it automatically, but here as well, opening the PDF needs an extra click.
If I copy the PDF to a different Server (Django installation with lighttpd), Firefox and Chrome will display it nicely as usual.