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CloseReview for Live HTTP Headers by Christopher Ditto
Rated 5 out of 5 stars
This sidebar is, in a number of ways, superior to the to "Net" functionality in FireBug. It is more stable than Firebug, it displays absolutely everything that appears in the sent and received HTTP headers, and the "Save All" feature is extremely useful. This add-on has helped me solve dozens of very tricky Web site issues. It is one of the first things I add to every new Firefox install.
This review is for a previous version of the add-on (0.15).To create your own collections, you must have a Mozilla Add-ons account.