View the source code of any Chrome extension in the Chrome Web store without installing it.
https://chrome.google.com/webstore/detail/chrome-extension-source-v/jifpbeccnghkjeaalbbjmodiffmgedin

Also available for Opera and Opera's add-on gallery.
https://addons.opera.com/extensions/details/extension-source-viewer/

Online demo (select a .crx / .nex / .zip from your disk to try out the viewer):
https://robwu.nl/crxviewer/

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 "View source" option opens a new tab with a simple viewer, with the following features:

• Download-as-zip at the upper-right corner.
• List of file names, and the option to filter files with a regular expression.
• Automatic beautification (formatting) of code
• Syntax highlighting
• Image preview

As mentioned before, this extension activates on the Chrome Web Store by default. It's also possible to view the source code of Chrome and Opera 15+ extensions that are hosted somewhere else. Further, there's 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 declarativeWebRequest API, which is only available to Chromium beta/dev users (though it should soon be available to the general public).

(c) 2013 - 2014 Rob Wu [email protected] (https://robwu.nl/)