User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0 Build ID: 20171008220130 Steps to reproduce: 1. Perform an XHR request (I've tried with both failed requests, 504 response code; and with successful requests, 200 response code) 2. Click "Edit and send again" 3. Edit your requests' payload 4. Click "Send" Actual results: Nothing happens (no new request created). Note that I was able to repeat a simple JS request without a problem. Expected results: A new request should be sent

This works for me. Do you see the request if the "All" filter is on? Honza

(In reply to Jan Honza Odvarko [:Honza] from comment #1) > This works for me. > > Do you see the request if the "All" filter is on? > > Honza Yes, it does show up when "All" or "Other" filter is selected. In that case, this behaviour must have changed, because in the older versions of Firefox this was definitely considered a "XHR" request. So it's either a regression, or just a deliberate change that I was not aware of.

Thanks for the update! This is dup of bug 1377741 Honza