mozilla isn't clearing all cookies when I have that always spec'd to clear on closing the browser
I have the bit set to clear cookies when I close Firefox. When I reopen, quite often , besides the default google cookie (due to home page) but one or two of the cookies from the previous session. This is disturbing :)
Alla svar (2)
Are you reopening tabs from the previous session automatically?
In that case cookies from these tabs are stored in sessionstore.jsonlz4 as part of the session data.
See also:
No luck, but many thanks for taking the trouble to render assistance :)