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About this Add-on
A video of this extension doing its duty can be found here: http://www.youtube.com/watch?v=QyVgRXQ8WHw
This extension should work on any post-4.X version of Firefox with the current UI setup. I doubt it will change any time soon (10/2011), and I've tested it with versions up to 10a, but that was with compatibility forcing in Nightly Tester Tools, I didn't update the version compatibility in the addon, I don't believe.
Feel free to shoot me an email or a comment here if you want it updated or have a feature request, etc.