Firefox 38.0.5 has added a feature called Reader View which essentially strips a page of adds and anything it doesn't consider readable content. I haven't really gotten into what it's hiding but the effect is pretty extreme. I also don't see that the feature is available for every web page so I haven't even been able to ascertain if the view persists from page to page. (after further review, it looks to be a current-page-only setting as opposed to a browsing mode).
I'm curious to see how damaging this could be to publishers and what sort of features need to be on a page before this option shows itself. Anyone else seen this yet?