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Adds a page action to pretty-print JSON. Unlike similar extensions, this simply pretty-prints it. It doesn't add any kind of viewer, colors, or collapsing. If you want this to work as expected, disable devtools.jsonview.enabled in about:config.

Simple addon which adds a button to the address bar for JSON content to pretty-print (format) it. To reduce clutter, the button is only present when the currently viewed content has a Content-Type of application/json or if the page content is valid JSON. Doesn't add a fancy viewer or colors or collapsing or anything.

If you want this to work as expected, disable devtools.jsonview.enabled in about:config.