This plugin seems quite helpful, thank you for coding it and putting it out there.
What I would most like it to do, however, it doesn't seem to. Namely, display the $_POST that was received before the latest page render. Firebug is showing me the POST content, but the array is always empty in the Blackbox Globals arrays list.
I wish I had more time to look at it and learn why, to help here, but I don't and I thought someone would either know why, or would like to know.