Viewing PDF files inside some browsers can be very slow or can freeze up. It is highly recommended that you adjust the settings of Adobe Acrobat Reader to view PDFs outside of any browser. The instructions on how to do this are as follows:
Open Adobe Acrobat Reader.
At the top of the Adobe Reader window, click the Edit menu, and select Preferences, to open the Preferences window.
In the left pane of the Adobe Reader Preferences window, select the Internet section.