If you close a tab with an un-posted question, it is saved as a draft for next time you come back. Handy, but often I answer my question in the process of writing it and don't want to save it. Next time I have a question I then have to discard or delete my draft before starting. I would like to suggest the option to discard a question while writing it.
Also - you get a modal "Leave Site?" popup if you try to close a tab with a draft - but since it saves your question this seems superfluous to a degree.