I just downloaded the Firefox Browser and tried to log into KC, but it would not let me do so because of my cookie settings on it.
I deleted my entire browsing history which I may have imported from IE and somehow, that did the trick. How does that have anything to do with cookie settings, and what settings should I have to prevent this from happening again?
Speaking for myself, my Firefox knowledge is marginal. I suggest you ask over in the Mozilla forums. Either there or the SMF forums. They are better equipped to support browser and forum login related questions.