I would find it really helpful if there was a way to know which cookies for a given website (e.g. google.com) do what? The reason behind is that I'd like to be able to keep just the (Google) cookies for login as well as my preferences (such as language, etc.). However, I'd like all other cookies to be removed. The difficulty here is identifying which cookies do what.

Yet I haven't checked the checkbox to open Cookie (v6.3) at login:

I've had to completely uninstall Cookie 6 because it was constantly displaying a popup requesting access to the folder Application Support. Even after allowing access several times, the popup would re-appear incessantly. It's a real nuisance and difficult to get rid of because Cookie 6 doesn't appear in Force Quit. If I remember correctly, this has happened since I completely uninstalled Firefox. I hope a fix will soon be made available.