Allows you to download the extension's source code without installing it.
$ npm install -g chrome-ext-downloader
Usage: ced <extension-id>
Say you want to download the source code of Google Mail
Checker.
Grab the ID of the extension from the URL, in this case it's mihcahmgecmbnbcchbopgniflfhgnkff. Then simply run the following and you will have the source code in the current directory.
$ ced mihcahmgecmbnbcchbopgniflfhgnkff
MIT