Firefox add-on that define words using English Wiktionary

[Test Pilot]

Open source, GPL tool.

You can check it using Mozilla web site: https://addons.mozilla.org/en-US/firefox/addon/7675 (registration required)
or or from public hosting: http://www.autohotkey.net/~TePe/WikiLook.xpi (right click, Save Link As, and then open file using Firefox).

I'm looking for someone who can give a hand with development.