My first foray into the world wide web was in the late 90's, and a lot of angelfire websites popped up on search results, so I wouldn't be surprised if an anglefire hosted website was the first one I visited, but honestly, I don't remember.
I do remember visiting an LDS site and chatting/debating with Mormons, because at the time I attended a Lutheran church and lived in Utah,
and the internet offered anonymity to challenge them openly. Ironically, my would be wife was also there, being a Christian who had recently entertained some Mormon missionaries in Australia, and was there for similar reasons, lol.