bank claims firefox does not delete cookies although options set to do it
I use firefox 20.0.1. I set options to delete cookies when firefox closes. My bank claims to detect previous session cookies on my computer which were not deleted. Basically when their web site detects a new computrer for an account it requires an additional challenge question. I am not getting this expected challenge question. The bank is recognizing the computer although all cookies should have been deleted.
Are you closing all tabs with that bank site before closing Firefox?
When you reopen website automatically on a next start then Firefox will store cookies used in those tabs in the sessionstore.js file as part of saved session data, so you won't get logged off when you close Firefox without first closing those tabs.
If clearing cookies doesn't work then it is possible that the cookies.sqlite file that stores the cookies is corrupted.
Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.