Browsers should prompt on closing

Browsers are getting smarter and smarter day by day but I don't know why they are not thinking about lot silly features that might help many users in the world. I'll talk about one right now. You know, browsers can prompt with message whether you want to save session for the next time or not (I don't use this feature).


Browsers also asks on closing weather you want to clear cache, cookie etc. But no browser prompt on closing if i did any change in any web page, especially in any form. Say, I'm filling up a form. I typed some data in it but not yet done. Accidentally I clicked close and browser was closed. It never asks me that I was in a form where I typed some data. Browser should ask in these kind of cases. I often lost my important browser window.

I thought, google chrome browser would provide this. But unfortunately it does not.