Sometimes I want to edit one of my answers and then realize I don't have to.
But there's no way for me to go back to the question without clicking on "Save your edits".
So I end up closing the tab or hitting the back button, which is a bit annoying.
I think a "cancel" button should be added next to "Save your edits".
I really think that making the user have no choice but hitting the Back button is bad design. It makes you dependant to the browser. Look at web apps like Gmail or whatever, you can do everything only using controls provided by the app itself. And I like this. Of course you should be able to use the back button too.
Refer to the discussion below to have a clearer understanding of what I mean.
The name of this button/link could be whatever: "cancel", "back to answer", you name it...