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CloseReview for Live HTTP Headers by Matthew Larson
Rated 5 out of 5 stars
Great tool - I use it almost daily. Please (please) release the firefox 4 version soon so I don't have to revert to the sllooow firefox 3.
This review is for a previous version of the add-on (0.16).To create your own collections, you must have a Mozilla Add-ons account.