# Universal File Viewer

> Beautify and highlight JSON, YAML, XML, CSV, and TOML files with syntax highlighting, tree view, and formatting tools directly in Firefox browser tabs.

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

## Overview

- **ID:** `universal-file-viewer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** walid ahdouf
- **Daily users:** 1
- **Weekly downloads:** 2
- **Version:** 3.0.1
- **Last updated:** 2026-04-25
- **First published:** 2025-09-22
- **Size:** 125 KB
- **Data as of:** 2026-04-27
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/universal-file-viewer/)

## Description

Transform raw data files into beautifully formatted, syntax-highlighted documents with interactive features. Supports JSON, YAML, XML, CSV, and TOML formats with automatic detection. Features include:

• Syntax highlighting with multiple themes
  • Interactive tree view for JSON/YAML structures• Raw/formatted view toggle
  • Copy to clipboard functionality
  • Download formatted files
  • Customizable settings (line numbers, indentation, themes)
  • Statistics tracking for file usage

Perfect for developers, data analysts, and anyone working with structured data files. No external dependencies required - works entirely offline.

## Permissions and access

### Permissions

- `<all_urls>`
- `storage`
- `clipboardWrite`
- `webRequest`
- `webRequestBlocking`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High 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 is not longer available in the store

> 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/universal-file-viewer)