User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:44.0) Gecko/20100101 Firefox/44.0 Build ID: 20160210153822 Steps to reproduce: I try to debug the response sent by a server: - with a Json content-type header, - with a non json content (e.g. plain string). I am using: - the default developer tools provided with Firefox (F12), - the network tab, - I click on a json request, - I go to the Response tab of the json request. Actual results: The red error "SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data" is displayed at the top of the json request tab. I have not found any way to see the actual HTTP request body response from the server. Expected results: If the developer tools cannot parse the HTTP request body, it should display the request body as text. This problem appears with the Json parser, but I guess it is also present with the image parser: https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor Moreover, it would be awesome if the user could change the parser used by Firefox in this tab: Text, JSON, Image, XML... For example, if the server sends a wrong content type but returns a json object, we would be able to select the json parser to render a human readable object. A dropdown box could be displayed above the error message :)

I believe this is the same as bug 859138, so I'll dupe it there. Feel free to reopen if it seems different. As a workaround, you can right-click a request and "Copy Response", but then you'd have to paste it somewhere.