They could at least make it possible choosing not to upgrade a very simple extension which we may have been personally reviewed.
I want a fixed (read: no updates) extension that does this: On key press, check if the key is backspace, when it is, check if any form element is focused, when not, go back. One line of JS, I guess three with nice formatting. If I create this, I need to submit it to the Chrome Store so Chrome won't complain about untrusted extensions.
Of course they also removed the ability to tell it that I know what I'm doing.