I posted an answer on SO but may be worth repeating here. The screenshots show "reddit.com" as clear-on-exit and "www.reddit.com" as the owner of the cookie. W

I posted an answer on SO but may be worth repeating here. The screenshots show "reddit.com" as clear-on-exit and "www.reddit.com" as the owner of the cookie. When adding a site to the clear-on-exist list, the box shows [*.]example.com I think you need to use [*.]reddit.com if you want to include sub-domains too.