# Monaco JSON Viewer

> This extension replaces the regular json file viewer in Firefox and opens json using the Monaco editor. For the extension to work, you must disable the devtools option.jsonview.enabled in the about:config section.

Canonical page: [https://chrome-stats.com/d/monaco-json-viewer](https://chrome-stats.com/d/monaco-json-viewer)

## Overview

- **ID:** `monaco-json-viewer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** streetraceing
- **Category:** web-development,download-management,appearance
- **Version:** 1.1
- **Last updated:** 2025-08-24
- **First published:** 2025-08-19
- **Size:** 5.33 MB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/monaco-json-viewer/)
- **Website:** [https://github.com/streetraceing/mjv/issues](https://github.com/streetraceing/mjv/issues)

## Description

The Monaco editor works well with large files, which is not the case with the regular Firefox viewer. This extension integrates a stripped-down version of monaco-editor-0.52.2 when viewing a document with the json content type. It has automatic support for light and dark themes, as well as support for a list of languages en, ru, de, es, fr, it, ja, ko, ZH-cn, zh-tw (determined by browser settings)

## Rankings

- #139,578 — Overall
- #141 — json

## Permissions and access

### Permissions

- `scripting`
- `notifications`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/monaco-json-viewer)