pdf not displaying properly in safari

From the Safari menu bar, select

Help ▹ Installed Plug-ins

Besides the following, what plugins are listed?

• iPhotoPhotocast
• Java
• QuickTime
• Shockwave Flash
• WebKit built-in PDF (absent in OS X 10.9 and later)

From the Safari menu bar, select

Safari ▹ Preferences ▹ Security

and uncheck the box marked Allow plug-ins. Your plugins, including Flash, won't work. Reload any open pages. Test. To reverse the change, check the box again.

If the Safari extension "Add to Amazon Wish List" is installed, disable it. Otherwise disable all extensions. Test.

Back up all data.

Triple-click anywhere in the line below on this page to select it:

defaults delete -app Safari WebKitOmitPDFSupport

Copy the selected text to the Clipboard by pressing the key combination command-C. Quit Safari.

Launch the Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.

Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.

Wait for a new line ending in a dollar sign (“$”) to appear. You can then quit Terminal. Test.