CRX Source Viewer от Tech Interval LLC

CRX Source Viewer lets you look inside any browser extension — Chrome, Firefox, or Edge — in one click. Open the extension's page, click "View Source," and every file inside the package is right there, formatted and searchable.

What makes it different

Most viewers just unzip the archive and leave you staring at minified code. This one automatically beautifies minified JavaScript, CSS, and HTML on open, so you can actually read what an extension does.

The Analysis tab reads the manifest and explains, in plain English, what each permission actually lets the extension do — with risk levels for permissions like "debugger", "cookies", and host access like <all_urls>. If you're deciding whether to trust an extension, that's usually the answer you're looking for.

Features

• View the full source of any extension from the Chrome Web Store, Firefox Add-ons, or Edge Add-ons
• Auto-beautify minified JavaScript, CSS, and HTML (toggleable)
• Analysis tab: permission risk audit, host access breakdown, content-script inspection
• File-tree sidebar with folder grouping, type filters, and file search
• Full-text search across every file (literal or regular expression)
• Syntax highlighting for JS, TS, JSON, HTML, CSS, and more
• File hashes: MD5, SHA-1, SHA-256, SHA-384, SHA-512
• Download the extension as a clean ZIP or the original signed package
• Drag-and-drop a local .crx / .xpi / .zip file into the viewer
• Interface available in 30 languages
• Dark mode

Privacy

This add-on fetches only the extension packages you ask it to inspect. It collects no analytics and tracks nothing.