Browsers now come with all manner of developer tools for debugging websites, inspecting code and even making live changes. HTML, CSS and XML are easily interpreted and presented in human-readable form, but just-as-important formats such as JSON still come out as a wall of monospaced text. Soon that won't be the case for Firefox.
Although Firefox has had a JSON viewer for a while, it was only switched on by default in the developer build and required a flag tweak to work elsewhere.
Mozilla recently made the decision to enable it in all channels, so users will have access to it immediately — no extra work required.
Even so, it'll be a few months before we see the change in the wild — for the stable channel, it's slated for Firefox 53, according to gHacks' Martin Brinkmann.
Nice to have another tool in the arsenal, especially for something as prolific as JSON.