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I heard that Firefox 5 had introduced support for native PDF reading but I tried opening a PDF link and it continues trying to ask me where to download the PDF.

Is this feature supposed to work only with specific PDF versions or should I activate some hidden settings?

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up vote 3 down vote accepted

I can see that they mention it

  1. In-browser preview: Firefox will also get an integrated PDF viewer (like Chrome) and will extend this capability to more popular file formats, including MP3.

Unfortuantly this doesn't look like the feature has been released yet.

In the mean time

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It's not here yet, but I believe that the plan is to bake PDF support in by using HTML5 + JavaScript, out to an SVG or <canvas> backend. See PDF.js.

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