In Chrome's address bar, type
The next time you view a PDF, it will load up right inside Chrome without using Adobe Reader! I have no idea why this feature is not enabled by default because it's a dream come true for anyone who spends a lot of time viewing PDFs online. Once you load up a PDF, you can drag the Chrome tab with the PDF in it, move it to your other monitor and continue browsing.
If you haven't used Google's Chrome browser, you need to download it and give it a try.