Google-chrome – Preventing Chrome from keeping the history

I can confirm that Incognito Mode does not have access to cookies, auto-fill form data, or WebSQL databases from normal mode. (At least, it does not carry over my GMail session, nor does it auto-fill my email or password into the login form).

As a web developer, Incognito mode is a great way to get an empty browser which provides a clean slate for testing a web page.

As far as I know (and I have just run Incognito mode to verify this, although things may have changed since the question was posted), you cannot see what cookies Incognito mode is keeping - the ones you see in that dialog are ones you had prior to running Incognito mode.

Since the two are supposed to be separate, one mode will not delete the other mode's cookies even if you visit the same site, i.e., if you go to Twitter (or if there's a twitter widget on a page) in regular browsing you may pick up a Twitter cookie, but Incognito mode will not remove that if you launch it later and subsequently close it.

If you can still reproduce this issue, make sure you do not have any extensions that may be causing this cookie to be created, and that your start pages do not have any Twitter widgets on them.

(I had a similar issue where "Keep local data only until I quit my browser" did not work for me, because one of my extensions was keeping the browser open. Either disabling such extensions or "Continue running background applications when Google Chrome is closed" should fix that problem.)