I cannot open PDF files when I am using Firefox, how can I fix this?

I cannot open PDF files while I am using Firefox. This is true for opening PDF pages in Firefox and outside of Firefox.

I ran into the same problem, and here is what I have done to fix it.
Go to Tools/Add-ons
You might have to get the latest Adobe Acrobat Reader (Likely 10.x.....)
On any exiting Adobe Acrobat Reader select disable (to disable the plug-in)
If you have already gotten the latest Adobe Acrobat Reader just disable any earlier version.
There is no official way to uninstall a plug-in so this it the workaround.
If you do need to uninstall the plugin you need to type about:config ....about:plugins search for the article to do it.

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