Can't open, download or view PDFs - Tried all fixes recommended on this site!

I updated Firefox yesterday and now I am suddenly unable to open, download or view PDF documents on my mac. I just get a blank page in Firefox when I click on a PDF link. 
I tried every fix I could find on this forum and others: 
Disabling both the Acrobat NPAPI Plugin and the Acrobat Reader Plugin 
delete the mimeTypes.rdf file in the Firefox Profile Folder to reset all file actions. 
installing another PDF reader plug-in 
Cleared download history 
Reset Firefox 
Checked status of Download Folder - no 'user set' values 
Reinstalled Firefox 
Fixed all Mac Permissions 
Still same thing PDF tries to open in a new tab - I just get a blank window… even when my PDF Preferences are set for the pop-up dialogue to show so I can choose whether to save, open or view. 
AND my Firefox preferences are set for viewing in Acrobat Pro X (this was how I had it set up before the update and had no problems - all PDFs opened in this application. (my preferred)
I am stumped. Anyone have any fresh ideas? HELP!! :) Thank you

The Adobe Reader plugin may not be working properly on Mac.
* https://support.mozilla.org/kb/pdf-files-are-blank-and-cant-be-downloaded-mac
* https://support.mozilla.org/kb/Opening+PDF+files+within+Firefox
Disable the Adobe Reader plugin in Firefox (Tools > Add-ons > Plugins) and use the external Adobe Reader application or Preview application instead.
PDF files may be found under entries like Portable document or Adobe PDF document.
*Firefox > Preferences > Applications > Adobe PDF document : Use Adobe Reader

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