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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
This'll probably be because you unplug the board while the Web IDE is still connected (you need to click disconnect first) - it's an annoying Chrome bug. It's been outstanding for a while, but hopefully they'll fix it in a release soon as someone's contributed a patch.
In terms of the actual crash - I believe the latest version of Espruino (1v77) should now have that fixed.