Comment Pitchforks down, please, no story here (Score 3, Informative) 234
TFA only mentions zoom levels as being stored -- not any other info from users' porn-mode browsing session, just zoom levels. Chrome recently began saving users' zoom levels (if I'm not mistaken) so that pretty much explains that (while conveniently also accounting for why users of earlier versions may not experiencing this phenomenon as well.)
We're all waiting for google to slip up monumentally (or "pull a facebook," if you will,) but unfortunately we'll have to wait another day.