For what it is worth, the local code from Chrome extensions is easily available on your computer for browsing. On windows they are located in the "C:\Users\<ACCOUNT NAME>\AppData\Local\Google\Chrome\User Data\Default\Extensions" folder. The extension folders are named with the ID of the extension, so it may take some trial and error to find the right folder or you can dig into the developer mode of Chrome to find the ID for a specific extension . The extensions themselves are just javascript and potentially HTML. You still won't be able to see any server side code, but it should at least tell you if anything you think is important is being saved or sent elsewhere.

See above comment. Meant to reply here, lol.