PDF doesn't open in Firefox

This seems to be a common problem. Firefox fails to open PDF files. It just shows a blank white screen. The common solution is to shut off the Adobe Reader add-on. Well, it didn't work for me. PDF is still not loading.

The NPAPI plugin by Adobe was blocked by FireFox because it caused the browser to crash...
You need to first disable the NPAPI plugin by going to Tools --> Add Ons and disabling that...
Then download the PDF Viewer Add-On that Firefox has for it's browser here: https://addons.mozilla.org/en-us/firefox/addon/pdfjs/
Then to make sure it's all working... Go to your preferences (command+,)
and click "applications"... Make sure the default is selected "Use Adobe Acrobat Pro (default)" -- (you might have to restart after adding the add-on before it shows up, not sure.
Relevent sites:
https://addons.mozilla.org/en-US/firefox/blocked/p89
https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file

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