Adobe Reader plugin for Firefox - Firefox 17/18 w Reader X/XI unable to view PDF

Our customers are having to use IE, which is not an option at some sites or roll Reader back to 9.4.5 to view our product. This issue started happening on 1/8/13.
No issues opening the PDFs
Originally installed on Win7
IE 8, FF11, Acrobat 9.4.5 – Windows updates turned off since 12/1/12
Installed IE 9, no issues
Installed FF 18.0.1 no issues
Issues opening the PDFs
Installed Reader XI, - kept Acrobat 9.4.5 installed - Unable to open catalogs in FF.

You don't say what it is about your "product" that is different from a regular PDF. I assume from the screenshot you are using LCDRM, but that in and of itself will not stop Reader XI from displaying the content.
Are your Firefox users actually using the Adobe Reader plugin? The latest build of Firefox has its own PDF renderer (which can't load LCDRM-protected files) - you need to specify that you want Reader to be the preferred plugin by changing the Firefox config.

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====================================================================================
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Adobe Reader plugin for Firefox - Firefox 17/18 w Reader X/XI unable to view PDF

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