The Firebug extension isn't being developed, so I have started use Firefox DevTools.
I have problem with unreadable request-response XML, because both strings are one-line string.
Firebug shows request-response XML nicer.
Any idea how to show pretty-print XML in Firefox DevTools?
The DevTools don't have this feature yet (as of Firefox 51.0.1). It's requested in bug 1247392, though.