Leosghost - 3:47 am on Dec 13, 2012 (gmt 0)

An attacker can get access to your mouse movements simply by buying a display ad slot on any webpage you visit,” the company writes. “The vulnerability is already being exploited by at least two display ad analytics companies* across billions of webpage impressions each month.

[theregister.co.uk...]

original story here..
[spider.io...]

demo here..
[iedataleak.spider.io...]

*and possibly a search engine or two ;)