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CloseReview for Live HTTP Headers by Hans Nordhaug
Rated 5 out of 5 stars
FYI: It does work in Firefox 3.5 beta - see https://www.mozdev.org/bugs/show_bug.cgi?id=21016
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.