No HTTP request is performed at Google Maps web site when it displays autocompletable values. How is it possible?

Question

I am using Firefox and Firebug in order to understand and learn how AJAX works. I am "inspecting" the Google Maps web site and when I move to the search input field entering some names then it is displayed a list of autocompletable values. However, the strange thing is that any AJAX HTTP Request was performed in order to retrieve those values. How is it possible?! That is, how Google Maps'd retrieve those values?

Note: The same doesn't happen at the Google web site.

Answer 1

I think that you have a problem with the way that you are using Firebug. I checked it in Chrome Developer Tools, and I see an Ajax request every time I type a key, as you would expect.