FireCrystal - "rewinds" web page interactions & shows code (stephenoney.com)

Cool idea but my first attempt at using it on a heavy AJAX page locked up Firefox for 10+ minutes (100% of one CPU core).

it would be nice, in theory, if we had an all encompassing data model of some kind that would be able to FF & RW the whole of everything. things like ZFS and message oriented middleware show the power of such things, but perhaps this is something for the far distant future