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Posts tagged "Safari"

April 30, 2013

Workaround for Safari 5.1.9 incompatibility with Adobe Reader and Adobe Acrobat

Mac OS has been one of a very widely used platform by Adobe customers. But recently, with a Safari upgrade the compatibility of Adobe Reader and Adobe Acrobat applications to open PDFs inside browser has again come to a hold.

As you install an Adobe Reader and Adobe Acrobat application on a Mac machine, the installer additionally installs a NAPI plugin inside Library -> Internet Plugins Folder, so that Mac users can open PDFs inside Safari using Adobe Reader/Acrobat app seamlessly (instead of using the conventional Preview which only supports a small set of PDFs).

But For Mac Snow Leopard users, the upgrade of Safari to 5.1.9 has proven fatal. Till Safari 5.1.8, users will be able to still open PDFs inside Safari without any issues. But post upgrading Safari to 5.1.9, Adobe Reader do not opens PDFs inside Safari.

As of now many users have reported this issue on Apple Blogs:

Some users have reported this issue via Bug to Apple as well (rdar://13694491)

To resolve the issue, I hereby give our Adobe users a quick workaround:-

Basically, the earlier versions of Safari used to have an entry in the for WebKitOmitPDFSupport which now do not exist anymore. So we just go and add it.

To add the entry:

1.)    Go to Library -> Preferences

2.)    Open “” in Property List Editor or any Text Editor like TextWrangler.

3.)    Add a new key with the name “WebKitOmitPDFSupport” of type Boolean and define its value as True (checked). i.e.:


4.)    Save the plist.

5.)    Restart Safari.

Property List Editor Snapshot

After applying the above workaround, users will be able to open PDFs inside Safari again. Note that, in case if you don’t have Adobe Reader / Adobe Acrobat installed on your Mac, then the above workaround will simply download the PDF onto your system.

Just for reference, Adobe fixed the same issue earlier in 2011 for Safari 5.1.0 :

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July 20, 2011

Compatibility Advisory Regarding Adobe Reader plug-in and Acrobat plug-in with Safari 5.1

With today’s release of the Safari 5.1 browser, we wanted to alert you of some compatibility issues and workarounds that relate to Adobe Reader and Acrobat. Adobe Reader and Acrobat are not compatible with the Safari 5.1 browser, announced today. Adobe Reader and Acrobat will continue to work as standalone applications on Mac OS X 10.7 and 10.6, and will render PDF documents outside of the browser, but applications that require the Adobe Reader or Acrobat plug-in to render PDF documents in the Safari browser will be affected. For Adobe Reader, Acrobat, and LiveCycle customers who utilize functionality like forms, digital signatures, portfolios, guides, 3D, extended PDFs and rights management, and who require the Adobe Reader or Acrobat plug-in to render PDF documents in the Safari browser, we recommend that you continue to use Safari 5.0.x and Mac OS X 10.6.

As we continue to investigate this, we will be sure to keep you updated. Currently, we expect to provide a better workaround for this issue before the end of 2011.

For more information, please see Knowledge Base Article CPSID_90885

Steve Gottwals, group product manager, Adobe Reader

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