Can't read PDFs with internal FF reader?

Firefox 19 added an internal PDF reader. It works fine for me when I click on PDF links on regular Web pages, but not when I double-click a PDF in Zotero. When I do that, it opens the internal reader but the PDF content doesn't appear. I have to right-click and choose the "Open in External Viewer" option instead.

Is there a way to read PDFs using the FF internal viewer instead? (I'm now on FF 21).

Thanks!
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