I have third party cookies blocked. It stays blocked, that is not the problem. However when I view cookies there are a huge number of third party ones on the list..from sites such as 2o7.net, ad.yieldmanager.com, and 33across.com. I delete all cookies, and then go look again and they are all back. There must be 50 of them. I have blocked all cookies and deleted them, and immediately they are back. WHY? How can I get rid of these for good, what puts them back and where are they hiding? I have restarted firefox, restarted my computer, etc.etc. Please advise. I don't want crapvertising cookies on my system!!