This extension supports two modes to deal with cookies:

1. "session" mode: delete cookies once the current session is closed (all browser windows are closed).
2. "tabs" mode: delete cookies related to the current tab once the tab is closed, and there are no other tabs of the same domain.

Example: Let's say you are logged-in into your email account:
In "session" mode, you will be logged-in until all browser tabs are closed.
In "tabs" mode, you will be logged-out once all email tabs are closed. So if you have two email tabs opened and still one tab is open, you are still logged-in. Once the other tab is closed, you will get logged-out

Note: the extension does not support cleaning  "window.localStorage" at this moment. I will work on that later!

To report bugs please use the review section of the FAQs page