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CloseReview for Live HTTP Headers by aaranged
Rated 5 out of 5 stars
A "must-have" for search engine optimization, especially for verifying 301 and 302 redirects. Now one of the first add-ons I install when I put Firefox on a new machine.
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.