Keep an eye on Shumway (Flash in JS)

Mozilla has a project to run Flash in Javascript without using the native plugin:

https://blog.mozilla.org/research/2012/11/12/introducing-the-shumway-open-swf-runtime-project/ http://mozilla.github.com/shumway/ https://github.com/mozilla/shumway

It doesn't sound like it can play Youtube videos yet. We'll want to keep an eye on it in case it ever can.