Chrome extension source viewer (CRX Viewer)
View the source code of any Chrome extension in the Chrome Web store without installing it.
Also available for Opera and Opera's add-on gallery.
And also available for Firefox and addons.mozilla.org (WebExtensions and other Firefox addon types). https://addons.mozilla.org/firefox/addon/crxviewer/
Online demo (select a .crx / .nex / .zip / .xpi from your disk or a URL to try out the viewer):
This Chrome extension adds a button to right of the omnibox when a CRX file has been detected. By default, this is only enabled on the Chrome Web Store. Upon clicking the button, two actions become available:
- Download extension as zip file
- View source
The default action (showing the above options) can be changed via the "Primary action on click" menu that appears when you right-click on the extension button.
The "View source" option opens a new tab with a simple viewer, with the following features:
- Download-as-zip and download-as-crx at the upper-right corner.
- List of file names, and the option to filter files with a regular expression.
- Find files containing a string, or with content matching a regular expression.
- Quickly jump between search results, or from/to a specific line.
- Automatic beautification (formatting) of code
- Syntax highlighting
- Image preview
- Show hashes (md5, sha1, sha256, sha384, sha512) of the file content.
- View content of embedded zip files.
- Download Chrome Web Store extensions for a different platform (e.g. Chrome OS or NaCl).
- View the contents of any URL or zip file.
- Permalink to file and search result within a zip or extension file.
As mentioned before, this extension activates on the Chrome Web Store by default. It's also possible to view the source code of Chrome, Opera 15+ and Firefox extensions that are hosted elsewhere. Further, there is an option to show a contextmenu entry on links whose target is a Chromium extension. Both features can be toggled at the options page.
The "View source for all extensions" only shows a button when it detects the download of an
extension. This detection is implemented through MIME-type sniffing using the
API, which is only available to Chromium beta/dev users (though it should soon be available to the
The Firefox addon is implemented as a WebExtension, which is recent technology. See firefox-stuff/compatibility.md for compatibility notes.
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.