JSON Viewer focuses on viewing JSON files in a readable format directly in Firefox. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is JSON Viewer for?

JSON Viewer is a consumer product built for firefox users and web developers.

Does JSON Viewer have a free plan?

Yes — JSON Viewer is free to use.

What platforms does JSON Viewer run on?

JSON Viewer runs on the web and embeddable surfaces.

Is JSON Viewer still active?

Unverified. JSON Viewer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to JSON Viewer?

Similar projects tracked by PulseGate include JSON Viewer Pro, HAR/JSON viewer, and JSONView.

Who makes JSON Viewer?

JSON Viewer is developed by li0ard.

How long has JSON Viewer been around?

JSON Viewer first shipped in 2019.

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JSON Viewer

Name: JSON Viewer
Author: li0ard

mozilla.orgBrowser DevTools & extensions

JSON Viewer is a Firefox browser extension that displays JSON files directly in the browser. It is intended for Firefox users and developers who need to inspect JSON responses or files in a more readable format.

FreeWebEmbeddableCloud-managed

Visit mozilla.org

1alternative

4features

2019since

Overview

4 features

In the Browser DevTools & extensions space, JSON Viewer takes a focused approach. It focuses on viewing JSON files in a readable format directly in Firefox. It is built as a consumer product for firefox users and web developers. JSON Viewer costs nothing to use. It runs on the web and embeddable surfaces.

Behind JSON Viewer is li0ard, and it first shipped in 2019. Key capabilities include JSON file viewing, browser integration, and website access. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

JSON file viewing
Browser integration
Website access
Firefox support

Built with & integrations

Runs on

BrowserEmbeddableCloud-managed

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed9 Sept · 06:17 UTC
JSON Viewer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about JSON Viewer

What is JSON Viewer?: JSON Viewer focuses on viewing JSON files in a readable format directly in Firefox. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is JSON Viewer for?: JSON Viewer is a consumer product built for firefox users and web developers.
Does JSON Viewer have a free plan?: Yes — JSON Viewer is free to use.
What platforms does JSON Viewer run on?: JSON Viewer runs on the web and embeddable surfaces.
Is JSON Viewer still active?: Unverified. JSON Viewer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to JSON Viewer?: Similar projects tracked by PulseGate include JSON Viewer Pro, HAR/JSON viewer, and JSONView.JSON Viewer Pro HAR/JSON viewer JSONView
Who makes JSON Viewer?: JSON Viewer is developed by li0ard.
How long has JSON Viewer been around?: JSON Viewer first shipped in 2019.

At a glance

Pricing: Free
Platforms: Web
First seen: 9 Sept 2026
Built for: Firefox users and web developers
Model: B2C
Solves: Viewing JSON files in a readable format directly in Firefox.

Registered as

Firefox Add-ons: json-viewer-nick

Developer

li0ard

Index record

Indexed: 9 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 9 Sept 2026

Identity audit (13)

Slug: json-viewer-mozilla-org
Lifecycle state recorded: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 9 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/json-viewer-nick

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