It's been a while since I pruned the amount of cookies Firefox has stored for me. There was so much crap I selected all of them and unselected the (about 10 out of probably a couple of hundred) ones I wanted to keep.
I'm now using the 'only allow from originating website' option in Firefox, but amiga.org needs to be among the exception list so that the user options are remembered when making news posts. No idea why, but if it's only one exception to the rule of blocking tonnes of crap cookies, it can't be that bad.