Firefox won't open pdf files; uninstalled and reinstalled Firefoxes, updated all extensions,etc. still getting error messages.

When I attempt to load a .pdf file, a window pops up reading "There is a problem with Adobe Acrobat/Reader. If it is running, please exit and try again. (4:4)"
I have tried rebooting the computer, uninstalling and reinstalling Firefox, making sure all plug-ins are updated (they are), disabling every other plug in to see if it was interfering (they weren't -- still got same message), and reinstalling adobe reader (and flash, just for good measure).

Did you try to disable hardware acceleration in Firefox?
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://hacks.mozilla.org/2010/09/hardware-acceleration/
Did you try a new profile without modifications?
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox
*https://support.mozilla.org/kb/Basic+Troubleshooting

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