How to open local PDFs with the new PDF viewer?

I'd like to use the new built-in PDF viewer in Firefox 19.0 Beta to view local PDFs from my computer. But when I try to open one with Firefox, instead of opening it with PDF.js, Firefox gives me a dialog asking "What should Firefox do with this file?" There isn't an option in Tools/Options/Applications to use PDF.js by default, so how can I use it for local files?

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