Is there a way in Google Chrome Developer tools to copy an AJAX request with the parameters? Firebug has this feature to "Copy location with parameters" for any async request and it is extremely useful.
For those still looking after all these years, Chrome's "Replay XHR" is as close as you get.
Debugger -> Network -> XHR -> right-click on request -> Replay XHR
The output can be seen in "Response" tab when you click on the new replayed request. If someone else finds a way to neatly copy all the post parameters like Firebug, let me know.
(Alternatively, I believe you can also install Firebug for Chrome)