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CloseReview for Live HTTP Headers by jgoodrich
Rated 5 out of 5 stars
Live http headers is a must for debugging cookie, server and http transaction information. I've told at least a hundred people they must download this extension if they are involved with web development.
This review is for a previous version of the add-on (0.14).To create your own collections, you must have a Mozilla Add-ons account.