easy fix to make it work in FF 4! thanks! Rated 5 out of 5 stars

Thanks Kopcap & jandys this was a great fix! -
https://addons.mozilla.org/en-US/firefox/addon/quickjava/reviews/277807/ -
https://addons.mozilla.org/en-US/firefox/addon/quickjava/reviews/274655/ -
Just make sure you have enabled show file extensions otherwise you can rename and it'll stay a zip file, I believe you know how to do that in case you don't see this http://www.fileinfo.com/help/windows-show-extensions.html

This review is for a previous version of the add-on (1.7.2.1-signed).