Question, whether html5 spec is specific about behavior for steps at... https://bugzilla.mozilla.org/show_bug.cgi?id=197709#c0
See also https://bugzilla.mozilla.org/show_bug.cgi?id=197709#c3 I dont see HTML5 is specific about it at http://www.w3.org/TR/html5/browsers.html#dom-open http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#dom-open So I think that Firefox bug report is invalid, but want to confirm....
