See: I didn’t make you wait too long for that SOAP submission tool. Lucky for all of us those gurus that write FireFox add-ons came up with one that does just what we want!
Called Poster, it’s described as “A developer tool for interacting with web services and other web resources that lets you make HTTP requests, set the entity body, and content type. This allows you to interact with web services and inspect the results.”
I won’t go into great detail here, since it’s a very straightforward concept and you can read all about it here on the FireFox add-ons page.
The UI is clean and works with various types of content:
Hmmm…I wonder if mega-humungo-giganticorp Microsoft has anything like this?