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Shumway is a Flash VM and runtime written in JavaScript


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Shumway is an HTML5 technology experiment that explores building a faithful and efficient renderer for the SWF file format without native code assistance.

Shumway is community-driven and supported by Mozilla. Our goal is to create a general-purpose, web standards-based platform for parsing and rendering SWFs. Integration with Firefox is a possibility if the experiment proves successful.

Getting started

Online demo

For an online demo, visit:


Install the Firefox extension:

This development extension should be quite stable but still might break from time to time. Also, note that the development extension is updated on every merge and by default Firefox will auto-update extensions on a daily basis (you can change this through the extensions.update.interval option in about:config, time is in seconds).

To build the Firefox extension: use grunt firefox.



See the wiki.

If you don't want to hack on the project or have little spare time, you still can help! Just install the Firefox extension, test it on SWFs in the wild, and report any problems or unimplemented features.

Our GitHub contributors so far:

You can add your name to it! :)

The easiest way to get started is to grep for TODOs and implement them.

Additional resources

Talk to us on IRC:

  • #shumway on

Post on our mailing list:

Subscribe either using or Google Groups: