This may be something you're aware of but don't care about and have sacrificed for some other benefit...
Before the update, if I was filling in a reply in the quick reply thing, and then accidentally hit the back button or something (which happens quite a lot), then I would hit forward, re-open the reply box and my text would still be there, saving my having to retype it all. Presumably the browser was doing this. That no longer happens, it's just blank.