Review for Live HTTP Headers by Alan De Smet
Rated 5 out of 5 stars
Does what it says on the box. I don't use it often, but when I do I'm thankful it's there. Great for debugging dynamic web sites and occasionally snooping the implementation of other web sites. Probably only of value to web developers and other web geeks.
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.