Shumway runs in every browser, including IE. The extension however is Firefox-only, but it should be easy to make it run in Safari or Chrome. We're just not familiar enough with those code bases to do it ourselves. It involves some intimate knowledge about how to intercept Flash player initialization.
Is it easier if Flash isn't installed? Because I don't have Flash installed at all, which is why I'm interested in Shumway. I have Chrome installed purely to use when I need Flash support.
Since it is javascript i guess it should run anywhere like pdf.js.
Works for me in Chrome 30 on Linux.
Chrome Version 30.0.1599.66, Linux works fine.
How'd you install it? The extension link gives me an .xpi Firefox extension download.