Storage Location for Unpacked Extensions

Extension engine does not explicitly change their location or add a reference to its local paths, they are left in the place where there are selected from in all Operating Systems.

Ex: If i load a unpacked Extension from E:\Chrome Extension the unpacked Extension is still in the same location

Storage Location for Packed Extensions

Navigate to chrome://version/ and look for Profile Path, it is your default directory and Extensions Folder is where all the extensions\app\themes are stored

Ex:

Windows

If my Profile Path is C:\Users\<Your_User_Name>\AppData\Local\Google\Chrome\User Data\Default them my storage directory is

C:\Users\<Your_User_Name>\AppData\Local\Google\Chrome\User Data\Default\Extensions

Linux

Chrome extensions are stored in: ~/.config/google-chrome/Default/Extensions/

Chromium

Chrome extensions are stored in ~/.config/chromium/Default/Extensions

출처 : http://stackoverflow.com/a/14544700