Unzipping zip archives with JavaScript in Firefox 3.6

I am toying with an application that will demo some Firefox 3.6 specific functionality, most of which are listed here: http://demos.hacks.mozilla.org/openweb/

I want to drag a zip file in the browser, unzip it, and work with the unzipped contents.

Are there any existing libraries that can do this? Does FireFox 3.6 in particular have something I can use? Or would I have to 开发者_如何转开发roll my own unzipper library?

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For the record: http://github.com/augustl/js-unzip

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There are existing libraries, here is one (as an example): http://code.google.com/p/jslibs/