On a Mac, passwords are not stored in the cookies to auto fill or whatever, they are kept in the keychain app and only when I log on to Facebook and Paypal right after dumping my cookies do they not remember my ip address of my computer and ask me to re authorize my computer to sign in again. The really malicious stuff comes from sites that curious people eventually check out with lots of images of people with less clothing on than more if you get my drift. And malicious sites have cookies that have names that you will not recognize, by design. So OCF, or the NY Times have cookies that say just that, others, well not so much. But for sure if you dump them all your world will not be noticeably different, which the first time I did it really surprised me. I was sure something world quit working.