I delete "revsci" but it immediately comes back. How to stop??
I can delete it using delete selected cookie, but it soon reappears. How can I stop it completely
Alla svar (1)
In Options -> Privacy -> Use Custom settings for History --
Above the 'Show Cookies...' button, you should see one marked 'Exceptions...'. Click that, enter the domain as it appears in the cookies list (eg, revsci.net) and click 'Block'. That should ensure revsci can't set any more cookies. If you delete the cookie now, it shouldn't reappear.
For a more aggressive approach, you can Disable third-party cookies altogether.