SharePoint 2010 will not open PDF files by default

By default, if you click on a PDF file in a document library, the file will not open in a browser.  Instead, a dialog box will show up prompting you to save the document to your hard drive.  This is supposed to "protect" the user from opening up malicious files.  Obviously, if you deal with PDF a lot, you can't expect people to download the file every time they want to edit or just look at it.  It pretty much defeats the entire purpose of the document library.  So, we have to "loosen up" this restriction.  Unfortunately, Microsoft does not provide a way to only "loosen up" this restriction for specific file types.  It's all or nothing.  So, follow these steps:

1. Central Admin
2. Manage Web Applications
3. Select your web application, and click General Settings / General Settings in the Web Applications ribbon.
4. Select the Permissive setting in the Browser File Handling section.