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About the first thing I do on any Mac is to use the disk utility to verify the disk, verify permissions, and then to repair permissions. &nbsp;Almost very Mac I see has permissions issues.<br />
Afterwards, try repairing Acrobat.
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Did as you suggested with the disk utility. There does not seem to be a way to repair Acrobat XI on the mac. No &quot;repair&quot; button under help. I'm guessing that I'll have to uninstall, reinstall, then apply the updates??????
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Have you tried this?<br />
<a href="https://helpx.adobe.com/acrobat/using/enable-createpdf-extension-firefox.html" rel="ugc">https://helpx.adobe.com/acrobat/using/enable-createpdf-extension-firefox.html</a>
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Yes, there is no adobe plug-in icon in additional tools and features. And there seems to be no way to update the plug-in.
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On a MacAir 10.10.5 with Acrobat 10.1.16 and Firefox 48 and Safari, the Acrobat Plug-in Create PDF could not be verified for use. And I can find no way to update it or get its signature verified. Stuck. Thanks.
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On a MacAir 10.10.5 with Acrobat 10.1.16 and Firefox 48 and Safari, the Acrobat Plug-in Create PDF could not be verified for use. And I can find no way to update it or get its signature verified. Stuck. Thanks.

Acrobat plug in could not be verfied in firefox (Mac)

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Adobe Acrobat is a family of application software and Web services developed by Adobe Systems to view, create, manipulate, print and manage files in Portable Document Format (PDF). The family comprises Acrobat Reader (formerly Adobe Reader), Acrobat (formerly Acrobat Exchange) and Acrobat.com. The commercial proprietary Acrobat, available for Microsoft Windows and OS X only, can also create, edit, convert, digitally sign, encrypt, export and publish PDF files.