Mouse grab page and move.
When looking at PDFs, it would be handy to be able to change the mode of the cursor. Right now there is no "grab th epage and move it" function. The only way to move side to side on a large PDF is to use the scroll bar or the middle mouse button. Neither are intuitive or easy to use when trying to shift around.
Many programs allow general selection, text selection and "grab and move" features for PDF viewing. Please try to include them on the Web view version.