ad "History management" section 1) I think most of those suggestions works already. FF remembers scroll positions and form states in history. It might be broken at pages which generates forms on-the-fly by javascript or force-reloads themselves into new location (eg. with different session ID in URL).
2) maybe good place to mention Submit to tab suggestion (and extension) https://bugzilla.mozilla.org/show_bug.cgi?id=17754 http://dragtotab.mozdev.org/submittotab/