illegitimate traffic from user agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)
Solution 1:
I think the user dflaw found it. It's the software from Genieo. We did some tests and contacted them. All results are published here.