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Rated 5 out of 5 stars
don't know why current version is not available here - but if you follow the link to the website, there is a Firefox 4.0 compatible version 0.17 available ...
Btw: one of the addons I can't work without ...
Version 0.17 available at http://livehttpheaders.mozdev.org/
The version 0.17 should be available here soon. It is currently pending review.