I just found this Web Browser Information script I did well over a year ago on my harddrive. It was already completed and in the current state that it’s in... and I have no idea why I hadn’t already posted it >.<; . I did a quick look over of the code and it all looks OK... so.. yeah, no idea. Anywho, here it is (v1.0 source).
Description: Outputs all the information the browser can gather from the user via JavaScript and the HTTP Headers.