Adobe ACROBAT READER 7.0 Manual page 62

Viewing in a browser in Mac OS
Adobe Reader works automatically with Safari version 1.2.3 or later and Mac OS 10.3 or
later to make viewing Adobe PDF documents on the web easy. The first time you open
Adobe Reader, your system automatically is configured to use Adobe Reader to open PDF
files in your browser. Adobe Reader does not add any tools or menus to the Safari toolbar
and menu bar.
Note: Be sure that Safari is not running the first time you start Adobe Reader.
When you view PDF documents in your browser, some keyboard commands may not be
available because they are mapped to the web browser. 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 the Print command in the browser.