Cannot open PDF in Firefox on MAC

I have looked at and tried almost every single solution provided in the community support but for some reason none of them seem to work! I cannot open a PDF in Firefox no matter what! I tried going to preferences and then application and then in action having it "preview in Firefox" - that did not work. I tried installing a plugin that was recommended - that didn't work. I tried everything and nothing is working!

Try to disable the Adobe® Acrobat® Plug-in for Web Browsers, Version 10.1.13 plugin ("Adobe Acrobat NPAPI") and check it again.
thanks again

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