CRX Source Viewer

About

CRX Source Viewer — Chrome Extension Source Code Viewer

CRX Source Viewer is a free Chrome extension source code viewer that lets you instantly view, read, and download the source code of any Chrome extension, Firefox addon, or Edge extension directly from the Chrome Web Store. View extension source code without downloading — just open any Chrome Web Store page and click to inspect the full code instantly.

If you want to view Chrome extension source code, check extension permissions, audit extension security, or learn how Chrome extensions are built — CRX Source Viewer is the tool you need.

Key Features

✅ View source code of any Chrome extension from the Chrome Web Store
✅ View Firefox addon source code from addons.mozilla.org
✅ View Edge extension source code from Microsoft Edge Add-ons
✅ Auto-beautify and format minified JavaScript into readable code
✅ Syntax highlighting for JavaScript, TypeScript, HTML, CSS, JSON
✅ Browse the complete extension file tree and folder structure
✅ Search inside extension source files using text or regex
✅ Download Chrome extension source code as ZIP or CRX file
✅ Inspect manifest.json, permissions, content scripts, and background scripts
✅ File hash verification — MD5, SHA-1, SHA-256, SHA-384, SHA-512
✅ Open local .crx .xpi .zip extension files by drag and drop
✅ Right-click any extension link to view source directly
✅ Fast, lightweight, and runs entirely locally in your browser
✅ Light mode and dark mode support

How to View Chrome Extension Source Code

1. Install CRX Source Viewer from the Chrome Web Store
2. Go to any Chrome extension page on chromewebstore.google.com
3. Click the CRX Source Viewer icon in your Chrome toolbar
4. Click View Source to open the extension source code viewer
5. Browse files, read code, search, and download — all in one click

Why Developers Use CRX Source Viewer

Chrome extension developers use CRX Source Viewer to inspect competitor extensions, learn from open source Chrome extensions, audit Chrome extension permissions, and understand how other extensions are built. Security researchers use it to check Chrome extensions for hidden trackers, data collection scripts, and malicious code before installing them.

CRX Source Viewer automatically detects minified and compressed JavaScript — the format most published Chrome extensions use — and reformats it into clean readable code using js-beautify. No other Chrome extension source code viewer does this automatically on every file.

Chrome Extension Security and Privacy Audit Tool

Want to know exactly what a Chrome extension does before you install it? CRX Source Viewer lets you read the raw source code, check what permissions are actually used, inspect network requests in the code, and verify file integrity with cryptographic hashes. Use it to audit Chrome extension privacy and security before trusting any extension with your browser.

Privacy

CRX Source Viewer does not collect any data. All extension source code is processed locally in your browser. No analytics, no tracking, no external servers. The only connection made is to Google's official CRX server to download the extension file — the same connection Chrome makes when you install any extension.

Perfect For

- Chrome extension developers
- Chrome extension security researchers
- Users who want to audit Chrome extension permissions
- Developers learning how to build Chrome extensions
- Privacy-conscious users checking extensions before installing
- Web developers and software engineers
- Open source extension contributors

Disclaimer: CRX Source Viewer is an independent Chrome extension and is not affiliated with, endorsed by, or sponsored by Google LLC, Mozilla Foundation, or Microsoft. Chrome Web Store, Firefox, and Edge are trademarks of their respective owners.