This extensions helps you to get source .crx extension file of any Chrome extension.
A simple right click on an extensions Web Store page lets you instantly get .crx source file of any Chrome extension.
P.S.: Please report bugs and/or provide suggestions to improve this extension :)
Get Give Me CRX Chrome extension here on Chrome Web Store.
Get this extension here on Chrome Web Store.
Update : this extension has been discontinued, though, you can still search for some good alternatives on the Chrome webstore here.