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The JSON viewer is new in Firefox 44.
Note that the JSON viewer is currently enabled only in Firefox Developer Edition and Firefox Nightly. To enable this feature in other release channels, set the devtools.jsonview.enabled preference to true.
Starting in Firefox 44, the Developer Edition includes a JSON viewer.
If you load a JSON document into the browser, it is parsed and given syntax highlighting. Arrays and objects are shown collapsed, and you can expand them using the "+" icons.
The JSON viewer provies a search box that you can use to filter the JSON.
You can also view the raw JSON and pretty-print it.
Finally, if the document was the result of a network request, the viewer displays the request and response headers.