Installed Firefox Portable with ABP and easylist only: ads still there.
Put in your filters as well: ads still there.
I'm on the verge of giving up, I must say
EDIT: I added this filter: hentaihaven.org###execphp-2 and the ads on the right of the page have disappeared, except for one, that is now floating on the top left of the page. When I check the code, it's just a plain div, with some text inside, no href, nothing.