Firefox cache? or tmp file/directory?

Grrrrr I was typing in a form (on /.) and my machine locked up~! Does anyone know 1.) If there would have been a tmp file somewhere with the contents of that form? 2.) If so, where? I had pressed the "preview reply" button and was editing when it happend. Not worth re-typing, though it's worth a shot to ask. Thanks in advance. B-)