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Not really. Looks like it has been abandoned (no commits in over a year) and last I checked it was by no means a capable replacement yet.

http://www.i-programmer.info/news/86-browsers/9473-mozilla-k...

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With some work, it can be revived and used to port old content to the web. One of the difficulties with Shumway was being but-for-bug compatible with the Flash player, which turned out to be nearly impossible... If the developer is in the loop, the task is a lot easier.

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