Instantly inspect, analyze, and download the source code of any Chrome, Firefox, or Edge browser extension — with beautiful syntax highlighting and auto-beautification.
Powerful tools to inspect any browser extension's source code, right from your browser.
Beautiful color-coded source with support for JavaScript, TypeScript, HTML, CSS, JSON, and more.
Minified code is automatically formatted with js-beautify on load. Clean, indented, readable code instantly.
Search across all files instantly with text or regex. Find API keys, permissions, or tracking code.
Download as ZIP or original CRX. Save individual files or the complete file tree offline.
Complete folder tree with file type icons, size indicators, and filters for Images, Code, Markup, and more.
Verify integrity with MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes.
Click "Add to Chrome" and pin to your toolbar. Works on Chrome, Edge, Brave, and any Chromium browser.
Navigate to any extension on Chrome Web Store, Firefox Add-ons, or Edge Add-ons.
Click the CRX icon and hit "View Source". Code is downloaded, extracted, and auto-beautified instantly.
Browse files, search across code, view hashes, download as ZIP. Everything runs locally — no data sent anywhere.
Common questions about CRX Source Viewer
Yes. Everything runs locally in your browser. No data collection, no external servers. Only fetches CRX files from Google's official servers.
Yes! Supports Chrome Web Store, Firefox Add-ons (AMO), and Microsoft Edge Add-ons.
Completely free. No hidden charges, no premium tiers, no ads.
Yes. Drag and drop any .crx, .xpi, or .zip file directly onto the viewer. Everything processed locally.
Join thousands of developers who use CRX Source Viewer to understand, audit, and learn from browser extensions.
Add to Chrome — It's Free