Neither Safari nor Firefox can view PDF files on the web - they appear blank?

Starting a couple of weeks ago, now when i'm at a web site and I click on a link that is a pdf, the screen is blank dark gray. I closed Safari and opened firefox and tried to see if that would work. Firefox also didn't display the pdf, just a blank white page. It had a note saying I needed to disable some plugin and restart, which I did, but it still doesn't display a pdf.
any suggestions? I keep all of my software updated and have Acrobat 9 as part of the CS5 suite on my system.

Try this...
Quit your browsers then open the Finder.
From the Finder menu bar click Go > Go to Folder
Type or copy/paste: /Library/Internet Plug-Ins
Click Go then move the Adobe PDF browser plugin to the Trash.
Relaunch a browser to test.

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Hi Mike,
It seems that we could use Internet Explorer to open a local .PDF file if it has the Adobe Reader. I doubt that the web control would be related to it. Like the MVP's suggset in the following thread, maybe it would be related
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Reference:
https://social.msdn.microsoft.com/Forums/en-US/a717117e-41ae-4775-9c28-d5a1042b396e/pdf-is-not-opening-in-web-browser-control-in-vbnet?forum=vbgeneral
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Adobe 9.1.3 and FireFox 3.5.1+ "...can not be used to view PDF files in a Web Browser"

This is the issue but I'm not sure there is a resolution:
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Adobe: Version 9.1.3
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Other information:
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The Adobe Acrobat/Reader that is running can not be used to view PDF files in a Web Browser. Please exit Adobe Acrobat/Reader and exit your Web Browser and try again.OK. I followed the instruction and the problem still persists.

I got the following pop-up when I tried to open an online PDF file:
The Adobe Acrobat/Reader that is running can not be used to view PDF files in a Web Browser.
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HT5678 I have problems saving pdf files in the web when I use Safari. I don't have this problem with firefox

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Neither Safari nor Firefox can view PDF files on the web - they appear blank?

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