# Source Code & Font Viewer — HTML/CSS/JS/JSON/XML

> View & format source code with syntax highlighting — HTML, CSS, JS, JSON, XML — plus a font viewer with glyph grid.

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

## Overview

- **ID:** `source-code-viewer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Nicolas Dos Santos
- **Category:** web-development
- **Daily users:** 15
- **Weekly downloads:** 7
- **Rating:** 4.50 / 5 (2 ratings)
- **Version:** 1.9.0
- **Last updated:** 2026-08-31
- **First published:** 2026-05-04
- **Size:** 687 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/source-code-viewer/)
- **Website:** [https://github.com/Kobee1203/Kobee1203.github.io/issues](https://github.com/Kobee1203/Kobee1203.github.io/issues)

## Description

Tired of staring at your browser's bland, unstyled source viewer? Source Code & Font Viewer is here to fix that. View — and format — the source of any web page with proper formatting and beautiful syntax highlighting, right from the "View Page Source" context menu or with a single click on the toolbar icon. No more walls of unreadable text. Just clean, colorized code, the way it should be.

✨ What you get:
• Beautiful syntax highlighting for HTML, CSS, JavaScript, JSON & XML
• Automatic formatting & beautification — pretty-print minified CSS, JS, JSON & HTML
• Automatic in-place formatting when you open a raw CSS/JS/JSON/XML file directly
• Full-text search (Cmd/Ctrl+F) across the entire source — not just the visible part — with next/previous, match case, whole word, regular expressions, and advanced structural search modes (XPath, CSS Selectors, JSONPath)
• One-click download of the formatted source with a smart filename — downloaded HTML still renders locally, and stylesheets keep finding their fonts & images
• A built-in font viewer — preview any web font (woff2, woff, ttf, otf) with your own sample text, size, weight & style, plus a glyph grid of the characters it covers (click a glyph to copy it)
• A range of light & dark themes
• Word wrap, line numbers & code folding
• Clickable links to jump between resources without leaving the viewer
• One-click switch back to the browser's native source view
• Available in multiple languages

Great for developers, web designers, and anyone who needs to view or format HTML, CSS, JavaScript, JSON, or XML source code — or inspect a web font. a clean source code viewer, JSON/XML viewer, font viewer, and code formatter in one.

## Rankings

- #27,662 — Overall
- #36 — source code
- #47 — json
- #50 — source
- #75 — resource
- #84 — html

## Permissions and access

### Permissions

- `activeTab`
- `tabs`
- `storage`
- `scripting`

### Host permissions

- `<all_urls>`
- `http://*/*`
- `https://*/*`

### Content script matches

- `*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates 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/source-code-viewer)