All a Chrome Extension is a few JavaScript files, an HTML page, and another file called a manifest file that tells Chrome a few settings. You can easily get to the source code of any extension.
1. Go to Tools > Extensions
2. Look for your extension’s ID. Note this down. You’ll need it later.
3. Open up Finder, then go to Go > Go to Folder …
4. Type Library and click Go.
It’s a hidden directory on the lastest version of OS X.
5. Navigate to Application Support > Google > Chrome > Default > Extensions
6. Look for a folder with the same extension ID, go there and now you have the source code for the extension!
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我的补充:
win8上的extension存储路径:
C:\Documents and Settings\feng\Local Settings\Application Data\Google\Chrome\User Data\Default\Extensions
根据ID去定位插件,源码全在那里啦~