This tool is useful when doing web or REST development, or when you need to make HTTP requests that are not easily done via the browser (PUT/POST/DELETE).
This is based off of the Poster addon, with a focus on preserving the history of transactions, allowing you to go back and review, re-execute, and save/load HTTP requests.
HttpRequester can be opened via the Toolbar button (dual-arrow icon).
Note that the Browser response view works well in conjunction with other response display addons like 'XML Pretty Viewer' and 'JSONView'. The HttpRequester browser will utilize the nicely-formatted displays that those addons provide.
See Developer's Comments section below for full usage details.