Since JSON explorer for HTTP network responses was quite successful feature (at least according to all the feedback I have got), I have implemented a XML Explorer that can be used to inspect XML based responses received from the server.
This feature allows to see XML data in pretty-printed and colorized fashion. Similarly to the JSON Explorer, the view is available within the Net panel (as soon as the response is XML).
See the following screenshot (click to enlarge).
The user can also right click on specific element and pick one of the Copy... actions to copy portions of the XML into the clipboard.