It works... Not as expected, but it works... I expected it to be integrated with Firefox, opening a JSON file directly from it, or entering edit mode on an open JSON (since Firefox 53, JSON files are natively viewable in it, so there's no need for JSON viewer extensions.) Long story short, it doesn't. Not only that, but it also cannot load or save JSON, it literally is a JSON editor, ONLY an editor, without any other functionality, not even load/save! The JSON data must be copied and pasted into the editor window and, after any editing is done, the code copied and pasted back out into a JSON file. The editor is awkward to use (at least, it has collapse/expand all options).

Can open large JSON files of 18 MB, something that Firefox internal json viewer can't (but simply opens it as text files). Also better because this is editor too.

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The text colors used are so light I can barely see them. Long gone are the days of black on white text. There seems no way to select different colors. In addition, the text is quite small, with no apparent way to zoom in. I can't see the text well enough even to evaluate this product and compare it with JSONedit, a nice standalone JSON editor and beautifier.

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I was thinking it was not working until i discovered that firefox had its own json viewer so i had to disable it on about:config devtools.jsonview.enabled,
will be cool a dark mode.