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Adobe Acrobat unable to open documents using Firefox 17.0.1, with Max )S X version 10.7.5. Am able to open in Safari.
Using Adobe flash player version 11.5.502.136, Adobe Reader XI version 11.0.0, AdobePDFViewer NPAPl.plugin, unable to open documents, receive error message, "Adobe Reader unable to open in this browser." Safari will open documents.