Display the PLAYER'S HANDBOOK or GAMEMASTER'S GUIDE. When these are visible in your browser, you can either print them (File / Print from the browser menu) or save them to your computer (File / Save As from the browser menu).
The books are indexed and labeled in the Table of Contents by numbered paragraphs, so page breaks are no longer important in finding the info you want.
The index is a massive thing, so you will need to display and/or print/save it separately.