Follow this article, you can use Adobe Reader as default app for Mac to view PDF files.
Adobe Reader for Mac is by far the only one PDF viewer which can open all PDF files. Although the default viewer for PDF documents in Mac OS X is Preview, Preview can't display dynamic/interactive content embedded into PDF forms such as drop down menus and calendar features. Otherwise, Adobe Reader for Mac can do all of those. I believe you wish to set Adobe Reader as the default app for PDF files on Mac.
This article enables you to set Adobe Reader as the default app for PDF files on Mac. Follow those steps to do it. However, before this you should make sure that you have Adobe Reader for Mac installed on your MAC.
Navigate to the page that contains the PDF file you wish to open and click on the link to that file. In the "Opening..." window that appears, click the "Open with" radio button and check the "Do this automatically for files like this from now on." check box. After that, click the "OK" button.

The PDF file will open in Preview or you may receive an error message. Close whichever one you see.
Go back to your Firefox browser and click "Firefox" in the main menu at the top of your screen. Click "Preferences..." < "Content" icon. Under "File Types" , click on the "Manage..." button and come into " Download Action" interface.

In the "Download Actions" widow that appears look for "PDF" under the "Extension" column. Click once on the PDF row to highlight it and then click the "Change Actions..." button.

In the next window, click the "Open them with this application" radio button. And then you will now see a "Select Helper Application" window.

After Adobe Reader has been clicked, you can click the "Open" button. So You will be brought back to the second of the "Download Actions" windows. Click the "OK" button.
You will now see the first "Download Actions" window. In this window you will now see "Open with Adobe Reader" under the "Actions" column.

After all has been done, you can close the "Download Actions" window and Firefox "Preferences..." window.
After Adobe Reader has been set as default browser, you can click it to view your PDF files on Mac as you please.
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