Firstly Sorry, your posts are not gone anywhere once you post, they come for moderation. We don't like moderation of any user's posts either, but "Spam" posts bother this forum.
When you are using Epic browser, do not worry about history or Cache of being stored, We do not leave any trace of them as they are removed once you exit your browser. So keep closing exiting your browser once you are done with your browsing, that keeps away any advertiser or trackers or cookies from tracking you.
Regarding autofill and autosuggest, here is how our concept goes, we have ranked many websites in our local database (which is not based on any one users browsing habit, but by the websites popularity), we ranked them, so when you type word "f", "facebook" being a top website we auto fill it, the next two or three websites that are popular with word "f" comes with search icon below, which is our auto suggest. We apply this concept only till first three letters of the website you are looking, there after autofill or autosuggest gets "off"
In your case foxnews is something that we show from our local database, it is not based on your browsing history or cache or cookies. For now we have not given autosuggest or auto fill configurable from settings page. We shall think on it and will inform you accordingly.