Adobe ACROBAT READER 7.0 Manual page 61

Viewing in a browser in Windows
You can view the PDF document in the web browser if you are using Internet Explorer 5.5
or later, Netscape Navigator 7.1 or later, or America Online 9.0 or later. Because keyboard
commands may be mapped to the web browser, some Adobe Reader shortcuts may not be
available. Similarly, you may need to use the tools and commands in the Adobe Reader
toolbar rather than the browser toolbar or menu bar. For example, to print a PDF
document, you need to use the Print button in the Adobe Reader toolbar rather than
choosing File > Print in the browser. (In Internet Explorer, you can choose File > Print,
Edit > Copy, and Edit > Find on the Internet Explorer toolbar.)