Somewhat absurdly, you currently need Flash to use Flash without Flash in many cases. We don't yet have support for installing Shumway in navigator.plugins, so sites that detect Flash using that (i.e., most of them) currently only work in Shumway if Flash is installed, too.
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I just tested against Firefox Nightly on the amazon pages and it doesn't appear to be even loading the Flash renderer.
We feature detect flash via the navigator.plugins object and from that thread it doesn't look like shumway is listed there.
(I'm a dev on that player)
(Shumway tech lead here)
Somewhat absurdly, you currently need Flash to use Flash without Flash in many cases. We don't yet have support for installing Shumway in navigator.plugins, so sites that detect Flash using that (i.e., most of them) currently only work in Shumway if Flash is installed, too.
This will be fixed once https://bugzilla.mozilla.org/show_bug.cgi?id=558184 lands.