Acrobat X and Adobe Reader X support viewing PDF files inside the Safari browser on Mac OS X. Acrobat X and Reader X do not support any other browser, such as Firefox or Opera. For more information about system requirements, click these links for your product: Acrobat X Pro, Acrobat X Standard, Adobe Reader X.
Adobe PDFViewer for Mac OS X requires the following system requirements:

Note: If you don't have Acrobat or Reader, or haven't installed the PDFViewer plug-in, then Safari shows PDF files using the Mac OS X native PDF support. Support for many Adobe PDF workflows (such as the Collaboration feature or many Forms and Security features) is unavailable.
The AdobePDFViewer plug-in is used to display PDF files in Safari using Acrobat and Reader. This plug-in is installed as part of the Acrobat X or Reader X installation. The location of this plug-in is:


/Library/Internet Plug-ins/AdobePDFViewer.plugin
The all-new Adobe Creative Suite 2 and Mac OS X v.10.4 (Tiger) make this a great time to be an Adobe customer on the Mac platform. Adobe and Apple have worked closely together through the development of Mac OS X 10.4 (Tiger) and Adobe Creative Suite 2 to. Download free Adobe Acrobat Reader DC software for your Windows, Mac OS and Android devices to view, print, and comment on PDF documents.
Install the latest version of Adobe Reader from Adobe - Adobe Acrobat Reader DC Distribution and check. What is the current version of the Mac OS installed? What is the version of Adobe Reader installed? To identify, refer to Identify the product and its version for Acrobat and Reader DC. Let us know how it goes and share your observation. My Adobe Reader will not open. It immediately crashes when I try to open it or a PDF file. I have uninstalled the program with the Adobe Cleaner and the then rebooted and reinstalled and the probem persists. I have searched the support community for answers, but have not found anything that works.
If Acrobat X or Reader X is installed alongside an older version of Acrobat or Reader, removing the older version removes the AdobePDFViewer plug-in.
To reenable Safari integration, rerun the installer over the current installation. Start the Acrobat/Reader X installer from the original media, and then follow the onscreen prompts to complete the installation.
Having multiple versions of Acrobat or Reader installed on the same system can cause plug-in conflicts. For example, suppose you have both Acrobat 9 and Acrobat X on your system and Acrobat 9 gets updated. In this case, the Acrobat 9 version of the AdobePDFViewer plug-in can overwrite the Acrobat X version of the plug-in. To correct the issue, follow these steps:
