I just lost all my changes to my google chrome plugin. However, the plugin is still running within the browser.
Where does Google Chrome store its cached copy of unpacked extensions?
I was able to find luck in:
C:\Documents and Settings\<username>\Local Settings\Application Data\Google\Chrome\User Data\<profile>\Extensions
EDIT: You can go to "chrome://version/" (like a url) and it shows your "Profile Path". There you can find an "Extensions" folder which is the one you're looking for.