PDF does not open

I tried EVERYTHING to get a PDF file to open it in firefox on my mac. They worked about 6 months ago but then stopped. I tried to change the application they open in preferences, applications, I tried to adjust the Add-ons, I tried to activate the pdf viewer. I'm using Firefox 41.0.1. I also run Adobe Acrobat Pro XI, version 11.0.12. Help! I had to start using safari, but now makes my battery burn on my mac so I would go back to firefox but I can't if I can't get PDF files to open it.

What is the setting for Portable Document Format (PDF) in "Firefox > Preferences > Applications"?

Is the built-in PDF Viewer active or an app like preview?

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Tags: Firefox

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