Firefox 22 won't open PDFs

Ever since updating Firefox/Mac to v.22, the built-in Firefox PDF viewer won't open PDFs. Any PDF link automatically downloads the file.
I've set the Applications control for PDFs to "Preview in Firefox". I've also reset the mimeTypes.rdf file, but none of this has helped. The files download to my HD. Firefox won't open PDFs on its own. I've had to resort to installing the Shubert plugin to get PDFs to display. It works, but I'd rather get Firefox's native reader to work.
Is there, perhaps, a setting under about:config that might need changed? I don't have to enable Java, do I?
Firefox 22/Mac OSX 10.6.8
Thanks.

If Portable Document Format (PDF) is set to "Preview in Firefox" in the Applications panel, as shown in [[How to disable the built-in PDF viewer and use another viewer|this KB article]] for Windows (Mac OS will be similar except for your default PDF viewer application ...Preview?... and available PDF Browser plugin, Shubert's)
And, if the issue isn't
*a downloader add-on
*another installed add-on (I see you have the Adobe Acrobat - Create PDF extension disabled; you also have [https://addons.mozilla.org/firefox/addon/pdfjs/ PDF Viewer] extension v 0.7.1 installed and disabled. I would uninstall PDF Viewer since it's now built-in to Firefox, since Firefox 19) or
*other profile issue (you could also try [[Use the Profile Manager to create and remove Firefox profiles|creating a new Firefox profile]] for testing)
Then:
Another possible route you could take would be to file a bug report at bugzilla.mozilla.org since your issue may be related to a change made in Firefox 22. For example, see these possibly related bugs (fixed in Firefox 22):
*[https://bugzilla.mozilla.org/show_bug.cgi?id=738967 Bug 738967] - pdf.js doesn't work for embedded PDFs
* [https://bugzilla.mozilla.org/show_bug.cgi?id=855666 Bug 855666] - Firefox Nighty 22.0a1 opens blank page instead of calling the third-party PDF reader plugin

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