I've searched the forums and unless I've missed it, no one seems to have mentioned that the new updated SiteAdvisor v.2.8.271 is leaving a list of every website visited in plain view for anyone to see. In my opinion, this is a heinous breach of privacy and it abhors me to think that a security company like McAfee would knowingly do this sort of thing. Many people take great pains to ensure that browsing history, cookies, cache etc. are swept away from the hard drive. And now, without any prior notice to users, McAfee have decided to secretly leave some sort of browsing history in Documents and Settings\NetworkService\Application Data\SACore\Cache
The contents of the "Data.dat" files seem to be SiteAdvisor's rating for each of the websites visited. Although this info is not in any way nefarious, just the fact that this list even exists has infuriated me to the point where I will uninstall this piece of foistware and be done with it. It also goes without saying that my opinion of McAfee has definitely been tarnished.
I don't use Firefox, maybe it’s different with that browser. Someone else can check that out if they want.