Firefox 4 isn't firing dragleave or dragexit when a drag leaves the window

I can't get the dragleave or dragexit events to fire when a drag leaves the window (Firefox4). In Chrome and Safari, this works as expecte开发者_运维知识库d.... you get a dragleave event when the drag leaves the window.

Is this expected behavior? Anyone know a workaround?

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So, to sum up the comments: This is a browser bug, it is still present apparently, and there is a jQuery-based workaround.