The site is http://www.yourfirefoxaddons.com. If you attempt to download the add-on, you get a hash error. I need both links (the one at the top of the page, and the one at the bottom) to function properly asap.
I don't think there is any issue with your extension. You should rename the 1st downloadable to [url removed, login to view] instead of zip. It installed fine on my firefox 2. In which version you get the error?
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I have already solved your problem. I have tested the installation from one of my websites. If you PM me, I can send you screenshots of the fixed extension as installed in my Firefox. PM me for more details.